drop table if exists t1,t2,t3;
SELECT 1 FROM (SELECT 1) as a GROUP BY SUM(1);
ERROR HY000: Invalid use of group function
CREATE TABLE t1 (
spID int(10) unsigned,
userID int(10) unsigned,
score smallint(5) unsigned,
lsg char(40),
date date
);
INSERT INTO t1 VALUES (1,1,1,'','0000-00-00');
INSERT INTO t1 VALUES (2,2,2,'','0000-00-00');
INSERT INTO t1 VALUES (2,1,1,'','0000-00-00');
INSERT INTO t1 VALUES (3,3,3,'','0000-00-00');
CREATE TABLE t2 (
userID int(10) unsigned NOT NULL auto_increment,
niName char(15),
passwd char(8),
mail char(50),
isAukt enum('N','Y') DEFAULT 'N',
vName char(30),
nName char(40),
adr char(60),
plz char(5),
ort char(35),
land char(20),
PRIMARY KEY (userID)
);
INSERT INTO t2 VALUES (1,'name','pass','mail','Y','v','n','adr','1','1','1');
INSERT INTO t2 VALUES (2,'name','pass','mail','Y','v','n','adr','1','1','1');
INSERT INTO t2 VALUES (3,'name','pass','mail','Y','v','n','adr','1','1','1');
INSERT INTO t2 VALUES (4,'name','pass','mail','Y','v','n','adr','1','1','1');
INSERT INTO t2 VALUES (5,'name','pass','mail','Y','v','n','adr','1','1','1');
SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid;
userid MIN(t1.score)
1 1
2 2
3 3
SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID GROUP BY t2.userid ORDER BY NULL;
userid MIN(t1.score)
1 1
2 2
3 3
SELECT t2.userid, MIN(t1.score) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid;
userid MIN(t1.score)
1 1
2 2
SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid;
userid MIN(t1.score+0.0)
1 1.0
2 2.0
SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid ORDER BY NULL;
userid MIN(t1.score+0.0)
2 2.0
1 1.0
EXPLAIN SELECT t2.userid, MIN(t1.score+0.0) FROM t1, t2 WHERE t1.userID=t2.userID AND t1.spID=2 GROUP BY t2.userid ORDER BY NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where; Using temporary
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.userID 1 Using index
drop table t1,t2;
CREATE TABLE t1 (
PID int(10) unsigned NOT NULL auto_increment,
payDate date DEFAULT '0000-00-00' NOT NULL,
recDate datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
URID int(10) unsigned DEFAULT '0' NOT NULL,
CRID int(10) unsigned DEFAULT '0' NOT NULL,
amount int(10) unsigned DEFAULT '0' NOT NULL,
operator int(10) unsigned,
method enum('unknown','cash','dealer','check','card','lazy','delayed','test') DEFAULT 'unknown' NOT NULL,
DIID int(10) unsigned,
reason char(1) binary DEFAULT '' NOT NULL,
code_id int(10) unsigned,
qty mediumint(8) unsigned DEFAULT '0' NOT NULL,
PRIMARY KEY (PID),
KEY URID (URID),
KEY reason (reason),
KEY method (method),
KEY payDate (payDate)
);
INSERT INTO t1 VALUES (1,'1970-01-01','1997-10-17 00:00:00',2529,1,21000,11886,'check',0,'F',16200,6);
SELECT COUNT(P.URID),SUM(P.amount),P.method, MIN(PP.recdate+0) > 19980501000000 AS IsNew FROM t1 AS P JOIN t1 as PP WHERE P.URID = PP.URID GROUP BY method,IsNew;
ERROR 42000: Can't group on 'IsNew'
drop table t1;
CREATE TABLE t1 (
cid mediumint(9) NOT NULL auto_increment,
firstname varchar(32) DEFAULT '' NOT NULL,
surname varchar(32) DEFAULT '' NOT NULL,
PRIMARY KEY (cid)
);
INSERT INTO t1 VALUES (1,'That','Guy');
INSERT INTO t1 VALUES (2,'Another','Gent');
CREATE TABLE t2 (
call_id mediumint(8) NOT NULL auto_increment,
contact_id mediumint(8) DEFAULT '0' NOT NULL,
PRIMARY KEY (call_id),
KEY contact_id (contact_id)
);
lock tables t1 read,t2 write;
INSERT INTO t2 VALUES (10,2);
INSERT INTO t2 VALUES (18,2);
INSERT INTO t2 VALUES (62,2);
INSERT INTO t2 VALUES (91,2);
INSERT INTO t2 VALUES (92,2);
SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid;
cid CONCAT(firstname, ' ', surname) COUNT(call_id)
SELECT cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY NULL;
cid CONCAT(firstname, ' ', surname) COUNT(call_id)
SELECT HIGH_PRIORITY cid, CONCAT(firstname, ' ', surname), COUNT(call_id) FROM t1 LEFT JOIN t2 ON cid=contact_id WHERE firstname like '%foo%' GROUP BY cid ORDER BY surname, firstname;
cid CONCAT(firstname, ' ', surname) COUNT(call_id)
drop table t2;
unlock tables;
drop table t1;
CREATE TABLE t1 (
bug_id mediumint(9) NOT NULL auto_increment,
groupset bigint(20) DEFAULT '0' NOT NULL,
assigned_to mediumint(9) DEFAULT '0' NOT NULL,
bug_file_loc text,
bug_severity enum('blocker','critical','major','normal','minor','trivial','enhancement') DEFAULT 'blocker' NOT NULL,
bug_status enum('','NEW','ASSIGNED','REOPENED','RESOLVED','VERIFIED','CLOSED') DEFAULT 'NEW' NOT NULL,
creation_ts datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
delta_ts timestamp,
short_desc mediumtext,
long_desc mediumtext,
op_sys enum('All','Windows 3.1','Windows 95','Windows 98','Windows NT','Windows 2000','Linux','other') DEFAULT 'All' NOT NULL,
priority enum('P1','P2','P3','P4','P5') DEFAULT 'P1' NOT NULL,
product varchar(64) DEFAULT '' NOT NULL,
rep_platform enum('All','PC','VTD-8','Other'),
reporter mediumint(9) DEFAULT '0' NOT NULL,
version varchar(16) DEFAULT '' NOT NULL,
component varchar(50) DEFAULT '' NOT NULL,
resolution enum('','FIXED','INVALID','WONTFIX','LATER','REMIND','DUPLICATE','WORKSFORME') DEFAULT '' NOT NULL,
target_milestone varchar(20) DEFAULT '' NOT NULL,
qa_contact mediumint(9) DEFAULT '0' NOT NULL,
status_whiteboard mediumtext NOT NULL,
votes mediumint(9) DEFAULT '0' NOT NULL,
PRIMARY KEY (bug_id),
KEY assigned_to (assigned_to),
KEY creation_ts (creation_ts),
KEY delta_ts (delta_ts),
KEY bug_severity (bug_severity),
KEY bug_status (bug_status),
KEY op_sys (op_sys),
KEY priority (priority),
KEY product (product),
KEY reporter (reporter),
KEY version (version),
KEY component (component),
KEY resolution (resolution),
KEY target_milestone (target_milestone),
KEY qa_contact (qa_contact),
KEY votes (votes)
);
INSERT INTO t1 VALUES (1,0,0,'','normal','','2000-02-10 09:25:12',20000321114747,'','','Linux','P1','TestProduct','PC',3,'other','TestComponent','','M1',0,'',0);
INSERT INTO t1 VALUES (9,0,0,'','enhancement','','2000-03-10 11:49:36',20000321114747,'','','All','P5','AAAAA','PC',3,'2.00 CD - Pre','BBBBBBBBBBBBB - conversion','','',0,'',0);
INSERT INTO t1 VALUES (10,0,0,'','enhancement','','2000-03-10 18:10:16',20000321114747,'','','All','P4','AAAAA','PC',3,'2.00 CD - Pre','BBBBBBBBBBBBB - conversion','','',0,'',0);
INSERT INTO t1 VALUES (7,0,0,'','critical','','2000-03-09 10:50:21',20000321114747,'','','All','P1','AAAAA','PC',3,'2.00 CD - Pre','BBBBBBBBBBBBB - generic','','',0,'',0);
INSERT INTO t1 VALUES (6,0,0,'','normal','','2000-03-09 10:42:44',20000321114747,'','','All','P2','AAAAA','PC',3,'2.00 CD - Pre','kkkkkkkkkkk lllllllllll','','',0,'',0);
INSERT INTO t1 VALUES (8,0,0,'','major','','2000-03-09 11:32:14',20000321114747,'','','All','P3','AAAAA','PC',3,'2.00 CD - Pre','kkkkkkkkkkk lllllllllll','','',0,'',0);
INSERT INTO t1 VALUES (5,0,0,'','enhancement','','2000-03-09 10:38:59',20000321114747,'','','All','P5','CCC/CCCCCC','PC',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (4,0,0,'','normal','','2000-03-08 18:32:14',20000321114747,'','','other','P2','TestProduct','Other',3,'other','TestComponent2','','',0,'',0);
INSERT INTO t1 VALUES (3,0,0,'','normal','','2000-03-08 18:30:52',20000321114747,'','','other','P2','TestProduct','Other',3,'other','TestComponent','','',0,'',0);
INSERT INTO t1 VALUES (2,0,0,'','enhancement','','2000-03-08 18:24:51',20000321114747,'','','All','P2','TestProduct','Other',4,'other','TestComponent2','','',0,'',0);
INSERT INTO t1 VALUES (11,0,0,'','blocker','','2000-03-13 09:43:41',20000321114747,'','','All','P2','CCC/CCCCCC','PC',5,'7.00','DDDDDDDDD','','',0,'',0);
INSERT INTO t1 VALUES (12,0,0,'','normal','','2000-03-13 16:14:31',20000321114747,'','','All','P2','AAAAA','PC',3,'2.00 CD - Pre','kkkkkkkkkkk lllllllllll','','',0,'',0);
INSERT INTO t1 VALUES (13,0,0,'','normal','','2000-03-15 16:20:44',20000321114747,'','','other','P2','TestProduct','Other',3,'other','TestComponent','','',0,'',0);
INSERT INTO t1 VALUES (14,0,0,'','blocker','','2000-03-15 18:13:47',20000321114747,'','','All','P1','AAAAA','PC',3,'2.00 CD - Pre','BBBBBBBBBBBBB - generic','','',0,'',0);
INSERT INTO t1 VALUES (15,0,0,'','minor','','2000-03-16 18:03:28',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','DDDDDDDDD','','',0,'',0);
INSERT INTO t1 VALUES (16,0,0,'','normal','','2000-03-16 18:33:41',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (17,0,0,'','normal','','2000-03-16 18:34:18',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (18,0,0,'','normal','','2000-03-16 18:34:56',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (19,0,0,'','enhancement','','2000-03-16 18:35:34',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (20,0,0,'','enhancement','','2000-03-16 18:36:23',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (21,0,0,'','enhancement','','2000-03-16 18:37:23',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (22,0,0,'','enhancement','','2000-03-16 18:38:16',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','Administration','','',0,'',0);
INSERT INTO t1 VALUES (23,0,0,'','normal','','2000-03-16 18:58:12',20000321114747,'','','All','P2','CCC/CCCCCC','Other',5,'7.00','DDDDDDDDD','','',0,'',0);
INSERT INTO t1 VALUES (24,0,0,'','normal','','2000-03-17 11:08:10',20000321114747,'','','All','P2','AAAAAAAA-AAA','PC',3,'2.8','Web Interface','','',0,'',0);
INSERT INTO t1 VALUES (25,0,0,'','normal','','2000-03-17 11:10:45',20000321114747,'','','All','P2','AAAAAAAA-AAA','PC',3,'2.8','Web Interface','','',0,'',0);
INSERT INTO t1 VALUES (26,0,0,'','normal','','2000-03-17 11:15:47',20000321114747,'','','All','P2','AAAAAAAA-AAA','PC',3,'2.8','Web Interface','','',0,'',0);
INSERT INTO t1 VALUES (27,0,0,'','normal','','2000-03-17 17:45:41',20000321114747,'','','All','P2','CCC/CCCCCC','PC',5,'7.00','DDDDDDDDD','','',0,'',0);
INSERT INTO t1 VALUES (28,0,0,'','normal','','2000-03-20 09:51:45',20000321114747,'','','Windows NT','P2','TestProduct','PC',8,'other','TestComponent','','',0,'',0);
INSERT INTO t1 VALUES (29,0,0,'','normal','','2000-03-20 11:15:09',20000321114747,'','','All','P5','AAAAAAAA-AAA','PC',3,'2.8','Web Interface','','',0,'',0);
CREATE TABLE t2 (
value tinytext,
program varchar(64),
initialowner tinytext NOT NULL,
initialqacontact tinytext NOT NULL,
description mediumtext NOT NULL
);
INSERT INTO t2 VALUES ('TestComponent','TestProduct','id0001','','');
INSERT INTO t2 VALUES ('BBBBBBBBBBBBB - conversion','AAAAA','id0001','','');
INSERT INTO t2 VALUES ('BBBBBBBBBBBBB - generic','AAAAA','id0001','','');
INSERT INTO t2 VALUES ('TestComponent2','TestProduct','id0001','','');
INSERT INTO t2 VALUES ('BBBBBBBBBBBBB - eeeeeeeee','AAAAA','id0001','','');
INSERT INTO t2 VALUES ('kkkkkkkkkkk lllllllllll','AAAAA','id0001','','');
INSERT INTO t2 VALUES ('Test Procedures','AAAAA','id0001','','');
INSERT INTO t2 VALUES ('Documentation','AAAAA','id0003','','');
INSERT INTO t2 VALUES ('DDDDDDDDD','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Eeeeeeee Lite','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Eeeeeeee Full','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Administration','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Distribution','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Setup','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Unspecified','CCC/CCCCCC','id0002','','');
INSERT INTO t2 VALUES ('Web Interface','AAAAAAAA-AAA','id0001','','');
INSERT INTO t2 VALUES ('Host communication','AAAAA','id0001','','');
select value,description,bug_id from t2 left join t1 on t2.program=t1.product and t2.value=t1.component where program="AAAAA";
value description bug_id
BBBBBBBBBBBBB - conversion 9
BBBBBBBBBBBBB - conversion 10
BBBBBBBBBBBBB - generic 7
BBBBBBBBBBBBB - generic 14
BBBBBBBBBBBBB - eeeeeeeee NULL
kkkkkkkkkkk lllllllllll 6
kkkkkkkkkkk lllllllllll 8
kkkkkkkkkkk lllllllllll 12
Test Procedures NULL
Documentation NULL
Host communication NULL
select value,description,COUNT(bug_id) from t2 left join t1 on t2.program=t1.product and t2.value=t1.component where program="AAAAA" group by value;
value description COUNT(bug_id)
BBBBBBBBBBBBB - conversion 2
BBBBBBBBBBBBB - eeeeeeeee 0
BBBBBBBBBBBBB - generic 2
Documentation 0
Host communication 0
kkkkkkkkkkk lllllllllll 3
Test Procedures 0
select value,description,COUNT(bug_id) from t2 left join t1 on t2.program=t1.product and t2.value=t1.component where program="AAAAA" group by value having COUNT(bug_id) IN (0,2);
value description COUNT(bug_id)
BBBBBBBBBBBBB - conversion 2
BBBBBBBBBBBBB - eeeeeeeee 0
BBBBBBBBBBBBB - generic 2
Documentation 0
Host communication 0
Test Procedures 0
drop table t1,t2;
create table t1 (foo int);
insert into t1 values (1);
select 1+1, "a",count(*) from t1 where foo in (2);
1+1 a count(*)
2 a 0
insert into t1 values (1);
select 1+1,"a",count(*) from t1 where foo in (2);
1+1 a count(*)
2 a 0
drop table t1;
CREATE TABLE t1 (
spID int(10) unsigned,
userID int(10) unsigned,
score smallint(5) unsigned,
key (spid),
key (score)
);
INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3),(6,3,3),(7,3,3);
explain select userid,count(*) from t1 group by userid desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort
explain select userid,count(*) from t1 group by userid desc order by null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary
select userid,count(*) from t1 group by userid desc;
userid count(*)
3 5
2 1
1 2
select userid,count(*) from t1 group by userid desc having (count(*)+1) IN (4,3);
userid count(*)
1 2
select userid,count(*) from t1 group by userid desc having 3 IN (1,COUNT(*));
userid count(*)
explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range spID spID 5 NULL 3 Using where; Using index
explain select spid,count(*) from t1 where spid between 1 and 2 group by spid;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range spID spID 5 NULL 3 Using where; Using index
explain select spid,count(*) from t1 where spid between 1 and 2 group by spid order by null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range spID spID 5 NULL 3 Using where; Using index
select spid,count(*) from t1 where spid between 1 and 2 group by spid;
spid count(*)
1 1
2 2
select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
spid count(*)
2 2
1 1
explain extended select sql_big_result spid,sum(userid) from t1 group by spid desc;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL spID NULL NULL NULL 8 100.00 Using filesort
Warnings:
Note 1003 /* select#1 */ select sql_big_result `test`.`t1`.`spID` AS `spid`,sum(`test`.`t1`.`userID`) AS `sum(userid)` from `test`.`t1` group by `test`.`t1`.`spID` desc
explain select sql_big_result spid,sum(userid) from t1 group by spid desc order by null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL spID NULL NULL NULL 8 Using filesort
select sql_big_result spid,sum(userid) from t1 group by spid desc;
spid sum(userid)
7 3
6 3
5 3
4 3
3 3
2 3
1 1
explain select sql_big_result score,count(*) from t1 group by score desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index score score 3 NULL 8 Using index; Using filesort
explain select sql_big_result score,count(*) from t1 group by score desc order by null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index score score 3 NULL 8 Using index; Using filesort
select sql_big_result score,count(*) from t1 group by score desc;
score count(*)
3 5
2 1
1 2
drop table t1;
create table t1 (a date default null, b date default null);
insert t1 values ('1999-10-01','2000-01-10'), ('1997-01-01','1998-10-01');
select a,min(b) c,count(distinct rand()) from t1 group by a having c<a + interval 1 day;
a c count(distinct rand())
drop table t1;
CREATE TABLE t1 (a char(1));
INSERT INTO t1 VALUES ('A'),('B'),('A'),('B'),('A'),('B'),(NULL),('a'),('b'),(NULL),('A'),('B'),(NULL);
SELECT a FROM t1 GROUP BY a;
a
NULL
A
B
SELECT a,count(*) FROM t1 GROUP BY a;
a count(*)
NULL 3
A 5
B 5
SELECT a FROM t1 GROUP BY binary a;
a
NULL
A
B
a
b
SELECT a,count(*) FROM t1 GROUP BY binary a;
a count(*)
NULL 3
A 4
B 4
a 1
b 1
SELECT binary a FROM t1 GROUP BY 1;
binary a
NULL
A
B
a
b
SELECT binary a,count(*) FROM t1 GROUP BY 1;
binary a count(*)
NULL 3
A 4
B 4
a 1
b 1
SET BIG_TABLES=1;
SELECT a FROM t1 GROUP BY a;
a
NULL
A
B
SELECT a,count(*) FROM t1 GROUP BY a;
a count(*)
NULL 3
A 5
B 5
SELECT a FROM t1 GROUP BY binary a;
a
NULL
A
B
a
b
SELECT a,count(*) FROM t1 GROUP BY binary a;
a count(*)
NULL 3
A 4
B 4
a 1
b 1
SELECT binary a FROM t1 GROUP BY 1;
binary a
NULL
A
B
a
b
SELECT binary a,count(*) FROM t1 GROUP BY 1;
binary a count(*)
NULL 3
A 4
B 4
a 1
b 1
SET BIG_TABLES=0;
drop table t1;
CREATE TABLE t1 (
`a` char(193) default NULL,
`b` char(63) default NULL
);
INSERT INTO t1 VALUES ('abc','def'),('hij','klm');
SELECT CONCAT(a, b) FROM t1 GROUP BY 1;
CONCAT(a, b)
abcdef
hijklm
SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
CONCAT(a, b) count(*)
abcdef 1
hijklm 1
SELECT CONCAT(a, b),count(distinct a) FROM t1 GROUP BY 1;
CONCAT(a, b) count(distinct a)
abcdef 1
hijklm 1
SELECT 1 FROM t1 GROUP BY CONCAT(a, b);
1
1
1
INSERT INTO t1 values ('hij','klm');
SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
CONCAT(a, b) count(*)
abcdef 1
hijklm 2
DROP TABLE t1;
create table t1 (One int unsigned, Two int unsigned, Three int unsigned, Four int unsigned);
insert into t1 values (1,2,1,4),(1,2,2,4),(1,2,3,4),(1,2,4,4),(1,1,1,4),(1,1,2,4),(1,1,3,4),(1,1,4,4),(1,3,1,4),(1,3,2,4),(1,3,3,4),(1,3,4,4);
select One, Two, sum(Four) from t1 group by One,Two;
One Two sum(Four)
1 1 16
1 2 16
1 3 16
drop table t1;
create table t1 (id integer primary key not null auto_increment, gender char(1));
insert into t1 values (NULL, 'M'), (NULL, 'F'),(NULL, 'F'),(NULL, 'F'),(NULL, 'M');
create table t2 (user_id integer not null, date date);
insert into t2 values (1, '2002-06-09'),(2, '2002-06-09'),(1, '2002-06-09'),(3, '2002-06-09'),(4, '2002-06-09'),(4, '2002-06-09');
select u.gender as gender, count(distinct u.id) as dist_count, (count(distinct u.id)/5*100) as percentage from t1 u, t2 l where l.user_id = u.id group by u.gender;
gender dist_count percentage
F 3 60.0000
M 1 20.0000
select u.gender as gender, count(distinct u.id) as dist_count, (count(distinct u.id)/5*100) as percentage from t1 u, t2 l where l.user_id = u.id group by u.gender order by percentage;
gender dist_count percentage
M 1 20.0000
F 3 60.0000
drop table t1,t2;
CREATE TABLE t1 (ID1 int, ID2 int, ID int NOT NULL AUTO_INCREMENT,PRIMARY KEY(ID
));
insert into t1 values (1,244,NULL),(2,243,NULL),(134,223,NULL),(185,186,NULL);
select S.ID as xID, S.ID1 as xID1 from t1 as S left join t1 as yS on S.ID1 between yS.ID1 and yS.ID2;
xID xID1
1 1
2 2
2 2
3 134
3 134
3 134
4 185
4 185
4 185
4 185
select S.ID as xID, S.ID1 as xID1, repeat('*',count(distinct yS.ID)) as Level from t1 as S left join t1 as yS on S.ID1 between yS.ID1 and yS.ID2 group by xID order by xID1;
xID xID1 Level
1 1 *
2 2 **
3 134 ***
4 185 ****
drop table t1;
CREATE TABLE t1 (
pid int(11) unsigned NOT NULL default '0',
c1id int(11) unsigned default NULL,
c2id int(11) unsigned default NULL,
value int(11) unsigned NOT NULL default '0',
UNIQUE KEY pid2 (pid,c1id,c2id),
UNIQUE KEY pid (pid,value)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1, 1, NULL, 1),(1, 2, NULL, 2),(1, NULL, 3, 3),(1, 4, NULL, 4),(1, 5, NULL, 5);
CREATE TABLE t2 (
id int(11) unsigned NOT NULL default '0',
active enum('Yes','No') NOT NULL default 'Yes',
PRIMARY KEY (id)
) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1, 'Yes'),(2, 'No'),(4, 'Yes'),(5, 'No');
CREATE TABLE t3 (
id int(11) unsigned NOT NULL default '0',
active enum('Yes','No') NOT NULL default 'Yes',
PRIMARY KEY (id)
);
INSERT INTO t3 VALUES (3, 'Yes');
select * from t1 AS m LEFT JOIN t2 AS c1 ON m.c1id =
c1.id AND c1.active = 'Yes' LEFT JOIN t3 AS c2 ON m.c2id = c2.id AND
c2.active = 'Yes' WHERE m.pid=1 AND (c1.id IS NOT NULL OR c2.id IS NOT NULL);
pid c1id c2id value id active id active
1 1 NULL 1 1 Yes NULL NULL
1 4 NULL 4 4 Yes NULL NULL
1 NULL 3 3 NULL NULL 3 Yes
select max(value) from t1 AS m LEFT JOIN t2 AS c1 ON
m.c1id = c1.id AND c1.active = 'Yes' LEFT JOIN t3 AS c2 ON m.c2id =
c2.id AND c2.active = 'Yes' WHERE m.pid=1 AND (c1.id IS NOT NULL OR c2.id IS
NOT NULL);
max(value)
4
drop table t1,t2,t3;
create table t1 (a blob null);
insert into t1 values (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(""),(""),(""),("b");
select a,count(*) from t1 group by a;
a count(*)
NULL 9
3
b 1
set big_tables=1;
select a,count(*) from t1 group by a;
a count(*)
NULL 9
3
b 1
drop table t1;
create table t1 (a int not null, b int not null);
insert into t1 values (1,1),(1,2),(3,1),(3,2),(2,2),(2,1);
create table t2 (a int not null, b int not null, key(a));
insert into t2 values (1,3),(3,1),(2,2),(1,1);
select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
a b
1 1
1 3
2 2
3 1
select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL;
a b
1 3
3 1
2 2
1 1
explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
1 SIMPLE t2 ALL a NULL NULL NULL 4 Using where; Using join buffer (Block Nested Loop)
explain select t1.a,t2.b from t1,t2 where t1.a=t2.a group by t1.a,t2.b ORDER BY NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary
1 SIMPLE t2 ALL a NULL NULL NULL 4 Using where; Using join buffer (Block Nested Loop)
drop table t1,t2;
create table t1 (a int, b int);
insert into t1 values (1, 4),(10, 40),(1, 4),(10, 43),(1, 4),(10, 41),(1, 4),(10, 43),(1, 4);
select a, MAX(b), INTERVAL (MAX(b), 1,3,10,30,39,40,50,60,100,1000) from t1 group by a;
a MAX(b) INTERVAL (MAX(b), 1,3,10,30,39,40,50,60,100,1000)
1 4 2
10 43 6
select a, MAX(b), CASE MAX(b) when 4 then 4 when 43 then 43 else 0 end from t1 group by a;
a MAX(b) CASE MAX(b) when 4 then 4 when 43 then 43 else 0 end
1 4 4
10 43 43
select a, MAX(b), FIELD(MAX(b), '43', '4', '5') from t1 group by a;
a MAX(b) FIELD(MAX(b), '43', '4', '5')
1 4 2
10 43 1
select a, MAX(b), CONCAT_WS(MAX(b), '43', '4', '5') from t1 group by a;
a MAX(b) CONCAT_WS(MAX(b), '43', '4', '5')
1 4 434445
10 43 43434435
select a, MAX(b), ELT(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f') from t1 group by a;
a MAX(b) ELT(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f')
1 4 d
10 43 NULL
select a, MAX(b), MAKE_SET(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h') from t1 group by a;
a MAX(b) MAKE_SET(MAX(b), 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h')
1 4 c
10 43 a,b,d,f
drop table t1;
create table t1 (id int not null, qty int not null);
insert into t1 values (1,2),(1,3),(2,4),(2,5);
select id, sum(qty) as sqty, count(qty) as cqty from t1 group by id having sum(qty)>2 and cqty>1;
id sqty cqty
1 5 2
2 9 2
select id, sum(qty) as sqty from t1 group by id having sqty>2 and count(qty)>1;
id sqty
1 5
2 9
select id, sum(qty) as sqty, count(qty) as cqty from t1 group by id having sqty>2 and cqty>1;
id sqty cqty
1 5 2
2 9 2
select id, sum(qty) as sqty, count(qty) as cqty from t1 group by id having sum(qty)>2 and count(qty)>1;
id sqty cqty
1 5 2
2 9 2
select count(*), case interval(qty,2,3,4,5,6,7,8) when -1 then NULL when 0 then "zero" when 1 then "one" when 2 then "two" end as category from t1 group by category;
count(*) category
2 NULL
1 one
1 two
select count(*), interval(qty,2,3,4,5,6,7,8) as category from t1 group by category;
count(*) category
1 1
1 2
1 3
1 4
drop table t1;
CREATE TABLE t1 (
userid int(10) unsigned,
score smallint(5) unsigned,
key (score)
);
INSERT INTO t1 VALUES (1,1),(2,2),(1,1),(3,3),(3,3),(3,3),(3,3),(3,3);
SELECT userid,count(*) FROM t1 GROUP BY userid DESC;
userid count(*)
3 5
2 1
1 2
EXPLAIN SELECT userid,count(*) FROM t1 GROUP BY userid DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort
DROP TABLE t1;
CREATE TABLE t1 (
i int(11) default NULL,
j int(11) default NULL
);
INSERT INTO t1 VALUES (1,2),(2,3),(4,5),(3,5),(1,5),(23,5);
SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL;
i COUNT(DISTINCT(i))
1 1
2 1
4 4
explain SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using filesort
DROP TABLE t1;
create table t1 (a int);
insert into t1 values(null);
select min(a) is null from t1;
min(a) is null
1
select min(a) is null or null from t1;
min(a) is null or null
1
select 1 and min(a) is null from t1;
1 and min(a) is null
1
drop table t1;
create table t1 ( col1 int, col2 int );
insert into t1 values (1,1),(1,2),(1,3),(2,1),(2,2);
select group_concat( distinct col1 ) as alias from t1
group by col2 having alias like '%';
alias
1,2
1,2
1
drop table t1;
create table t1 (a integer, b integer, c integer);
insert into t1 (a,b) values (1,2),(1,3),(2,5);
select a, 0.1*0+1 r2, sum(1) r1 from t1 where a = 1 group by a having r1>1 and r2=1;
a r2 r1
1 1.0 2
select a, round(rand(100)*10) r2, sum(1) r1 from t1 where a = 1 group by a having r1>1 and r2<=2;
a r2 r1
1 2 2
select a,sum(b) from t1 where a=1 group by c;
a sum(b)
1 5
select a*sum(b) from t1 where a=1 group by c;
a*sum(b)
5
select sum(a)*sum(b) from t1 where a=1 group by c;
sum(a)*sum(b)
10
select a,sum(b) from t1 where a=1 group by c having a=1;
a sum(b)
1 5
select a as d,sum(b) from t1 where a=1 group by c having d=1;
d sum(b)
1 5
select sum(a)*sum(b) as d from t1 where a=1 group by c having d > 0;
d
10
drop table t1;
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(8),(9);
create table t2 (
a int,
b varchar(200) NOT NULL,
c varchar(50) NOT NULL,
d varchar(100) NOT NULL,
primary key (a,b(132),c,d),
key a (a,b)
) charset=utf8;
insert into t2 select
x3.a, -- 3
concat('val-', x3.a + 3*x4.a), -- 12
concat('val-', @a:=x3.a + 3*x4.a + 12*C.a), -- 120
concat('val-', @a + 120*D.a)
from t1 x3, t1 x4, t1 C, t1 D where x3.a < 3 and x4.a < 4 and D.a < 4;
delete from t2 where a = 2 and b = 'val-2' order by a,b,c,d limit 30;
explain select c from t2 where a = 2 and b = 'val-2' group by c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref PRIMARY,a PRIMARY 402 const,const 6 Using where
select c from t2 where a = 2 and b = 'val-2' group by c;
c
val-74
val-98
drop table t1,t2;
create table t1 (b int4 unsigned not null);
insert into t1 values(3000000000);
select * from t1;
b
3000000000
select min(b) from t1;
min(b)
3000000000
drop table t1;
CREATE TABLE t1 (id int PRIMARY KEY, user_id int, hostname longtext);
INSERT INTO t1 VALUES
(1, 7, 'cache-dtc-af05.proxy.aol.com'),
(2, 3, 'what.ever.com'),
(3, 7, 'cache-dtc-af05.proxy.aol.com'),
(4, 7, 'cache-dtc-af05.proxy.aol.com');
SELECT hostname, COUNT(DISTINCT user_id) as no FROM t1
WHERE hostname LIKE '%aol%'
GROUP BY hostname;
hostname no
cache-dtc-af05.proxy.aol.com 1
DROP TABLE t1;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (1,2), (1,3);
SELECT a, b FROM t1 GROUP BY 'const';
a b
1 2
SELECT DISTINCT a, b FROM t1 GROUP BY 'const';
a b
1 2
DROP TABLE t1;
CREATE TABLE t1 (id INT, dt DATETIME);
INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
INSERT INTO t1 VALUES ( 1, '2005-05-01 12:30:00' );
SELECT dt DIV 1 AS f, id FROM t1 GROUP BY f;
f id
20050501123000 1
DROP TABLE t1;
CREATE TABLE t1 (id varchar(20) NOT NULL);
INSERT INTO t1 VALUES ('trans1'), ('trans2');
CREATE TABLE t2 (id varchar(20) NOT NULL, err_comment blob NOT NULL);
INSERT INTO t2 VALUES ('trans1', 'a problem');
SELECT COUNT(DISTINCT(t1.id)), LEFT(err_comment, 256) AS comment
FROM t1 LEFT JOIN t2 ON t1.id=t2.id GROUP BY comment;
COUNT(DISTINCT(t1.id)) comment
1 NULL
1 a problem
DROP TABLE t1, t2;
create table t1 (f1 date);
insert into t1 values('2005-06-06');
insert into t1 values('2005-06-06');
select date(left(f1+0,8)) from t1 group by 1;
date(left(f1+0,8))
2005-06-06
drop table t1;
CREATE TABLE t1 (n int);
INSERT INTO t1 VALUES (1);
SELECT n+1 AS n FROM t1 GROUP BY n;
n
2
Warnings:
Warning 1052 Column 'n' in group statement is ambiguous
DROP TABLE t1;
create table t1(f1 varchar(5) key);
insert into t1 values (1),(2);
select sql_buffer_result max(f1) is null from t1;
max(f1) is null
0
select sql_buffer_result max(f1)+1 from t1;
max(f1)+1
3
drop table t1;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (1),(2);
SELECT a FROM t1 GROUP BY 'a';
a
1
SELECT a FROM t1 GROUP BY "a";
a
1
SELECT a FROM t1 GROUP BY `a`;
a
1
2
set sql_mode=ANSI_QUOTES;
SELECT a FROM t1 GROUP BY "a";
a
1
2
SELECT a FROM t1 GROUP BY 'a';
a
1
SELECT a FROM t1 GROUP BY `a`;
a
1
2
set sql_mode='';
SELECT a FROM t1 HAVING 'a' > 1;
a
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 'a'
SELECT a FROM t1 HAVING "a" > 1;
a
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 'a'
SELECT a FROM t1 HAVING `a` > 1;
a
2
SELECT a FROM t1 ORDER BY 'a' DESC;
a
1
2
SELECT a FROM t1 ORDER BY "a" DESC;
a
1
2
SELECT a FROM t1 ORDER BY `a` DESC;
a
2
1
DROP TABLE t1;
CREATE TABLE t1 (
f1 int(10) unsigned NOT NULL auto_increment primary key,
f2 varchar(100) NOT NULL default ''
);
CREATE TABLE t2 (
f1 varchar(10) NOT NULL default '',
f2 char(3) NOT NULL default '',
PRIMARY KEY (`f1`),
KEY `k1` (`f2`,`f1`)
);
INSERT INTO t1 values(NULL, '');
INSERT INTO `t2` VALUES ('486878','WDT'),('486910','WDT');
SELECT SQL_BUFFER_RESULT avg(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
avg(t2.f1)
SELECT avg(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
avg(t2.f1)
DROP TABLE t1, t2;
create table t1 (c1 char(3), c2 char(3));
create table t2 (c3 char(3), c4 char(3));
insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
group by c2;
c2
aaa
aaa
Warnings:
Warning 1052 Column 'c2' in group statement is ambiguous
show warnings;
Level Code Message
Warning 1052 Column 'c2' in group statement is ambiguous
select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
group by t1.c1;
c2
aaa
show warnings;
Level Code Message
drop table t1, t2;
CREATE TABLE t1 (a tinyint(3), b varchar(255), PRIMARY KEY (a));
INSERT INTO t1 VALUES (1,'-----'), (6,'Allemagne'), (17,'Autriche'),
(25,'Belgique'), (54,'Danemark'), (62,'Espagne'), (68,'France');
CREATE TABLE t2 (a tinyint(3), b tinyint(3), PRIMARY KEY (a), KEY b (b));
INSERT INTO t2 VALUES (1,1), (2,1), (6,6), (18,17), (15,25), (16,25),
(17,25), (10,54), (5,62),(3,68);
CREATE VIEW v1 AS select t1.a, concat(t1.b,'') AS b, t1.b as real_b from t1;
explain
SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
where t2.b=v1.a GROUP BY t2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index b b 2 NULL 10 Using where; Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 1 test.t2.b 1 NULL
SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
where t2.b=v1.a GROUP BY t2.b;
a b real_b
1 ----- -----
6 Allemagne Allemagne
17 Autriche Autriche
25 Belgique Belgique
54 Danemark Danemark
62 Espagne Espagne
68 France France
DROP VIEW v1;
DROP TABLE t1,t2;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT, key (b));
INSERT INTO t1 VALUES (1, 1);
INSERT INTO t1 SELECT a + 1 , MOD(a + 1 , 20) FROM t1;
INSERT INTO t1 SELECT a + 2 , MOD(a + 2 , 20) FROM t1;
INSERT INTO t1 SELECT a + 4 , MOD(a + 4 , 20) FROM t1;
INSERT INTO t1 SELECT a + 8 , MOD(a + 8 , 20) FROM t1;
INSERT INTO t1 SELECT a + 16, MOD(a + 16, 20) FROM t1;
INSERT INTO t1 SELECT a + 32, MOD(a + 32, 20) FROM t1;
INSERT INTO t1 SELECT a + 64, MOD(a + 64, 20) FROM t1;
SELECT MIN(b), MAX(b) from t1;
MIN(b) MAX(b)
0 19
EXPLAIN SELECT b, sum(1) FROM t1 GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index b b 5 NULL 128 Using index
EXPLAIN SELECT SQL_BIG_RESULT b, sum(1) FROM t1 GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index b b 5 NULL 128 Using index; Using filesort
SELECT b, sum(1) FROM t1 GROUP BY b;
b sum(1)
0 6
1 7
2 7
3 7
4 7
5 7
6 7
7 7
8 7
9 6
10 6
11 6
12 6
13 6
14 6
15 6
16 6
17 6
18 6
19 6
SELECT SQL_BIG_RESULT b, sum(1) FROM t1 GROUP BY b;
b sum(1)
0 6
1 7
2 7
3 7
4 7
5 7
6 7
7 7
8 7
9 6
10 6
11 6
12 6
13 6
14 6
15 6
16 6
17 6
18 6
19 6
DROP TABLE t1;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1),(2,1),(3,2),(4,2),(5,3),(6,3);
SET SQL_MODE = 'ONLY_FULL_GROUP_BY';
SELECT MAX(a)-MIN(a) FROM t1 GROUP BY b;
MAX(a)-MIN(a)
1
1
1
SELECT CEILING(MIN(a)) FROM t1 GROUP BY b;
CEILING(MIN(a))
1
3
5
SELECT CASE WHEN AVG(a)>=0 THEN 'Positive' ELSE 'Negative' END FROM t1
GROUP BY b;
CASE WHEN AVG(a)>=0 THEN 'Positive' ELSE 'Negative' END
Positive
Positive
Positive
SELECT a + 1 FROM t1 GROUP BY a;
a + 1
2
3
4
5
6
7
SELECT a + b FROM t1 GROUP BY b;
ERROR 42000: 'test.t1.a' isn't in GROUP BY
SELECT (SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1)
FROM t1 AS t1_outer;
(SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1)
1
2
3
4
5
6
SELECT 1 FROM t1 as t1_outer GROUP BY a
HAVING (SELECT t1_outer.a FROM t1 AS t1_inner GROUP BY b LIMIT 1);
1
1
1
1
1
1
1
SELECT (SELECT t1_outer.a FROM t1 AS t1_inner LIMIT 1)
FROM t1 AS t1_outer GROUP BY t1_outer.b;
ERROR 42000: 'test.t1_outer.a' isn't in GROUP BY
SELECT 1 FROM t1 as t1_outer GROUP BY a
HAVING (SELECT t1_outer.b FROM t1 AS t1_inner LIMIT 1);
ERROR 42S22: Unknown column 'test.t1_outer.b' in 'field list'
SELECT (SELECT SUM(t1_inner.a) FROM t1 AS t1_inner LIMIT 1)
FROM t1 AS t1_outer GROUP BY t1_outer.b;
(SELECT SUM(t1_inner.a) FROM t1 AS t1_inner LIMIT 1)
21
21
21
SELECT (SELECT SUM(t1_inner.a) FROM t1 AS t1_inner GROUP BY t1_inner.b LIMIT 1)
FROM t1 AS t1_outer;
(SELECT SUM(t1_inner.a) FROM t1 AS t1_inner GROUP BY t1_inner.b LIMIT 1)
3
3
3
3
3
3
SELECT (SELECT SUM(t1_outer.a) FROM t1 AS t1_inner LIMIT 1)
FROM t1 AS t1_outer GROUP BY t1_outer.b;
ERROR 42000: 'test.t1_outer.a' isn't in GROUP BY
SELECT 1 FROM t1 as t1_outer
WHERE (SELECT t1_outer.b FROM t1 AS t1_inner GROUP BY t1_inner.b LIMIT 1);
1
1
1
1
1
1
1
SELECT b FROM t1 GROUP BY b HAVING CEILING(b) > 0;
b
1
2
3
SELECT 1 FROM t1 GROUP BY b HAVING b = 2 OR b = 3 OR SUM(a) > 12;
1
1
1
SELECT 1 FROM t1 GROUP BY b HAVING ROW (b,b) = ROW (1,1);
1
1
SELECT 1 FROM t1 GROUP BY b HAVING a = 2;
ERROR 42S22: Unknown column 'a' in 'having clause'
SELECT 1 FROM t1 GROUP BY SUM(b);
ERROR HY000: Invalid use of group function
SELECT b FROM t1 AS t1_outer GROUP BY a HAVING t1_outer.a IN
(SELECT SUM(t1_inner.b)+t1_outer.b FROM t1 AS t1_inner GROUP BY t1_inner.a
HAVING SUM(t1_inner.b)+t1_outer.b > 5);
ERROR 42000: 'test.t1_outer.b' isn't in GROUP BY
DROP TABLE t1;
SET SQL_MODE = '';
SET SQL_MODE = 'ONLY_FULL_GROUP_BY';
create table t1(f1 int, f2 int);
select * from t1 group by f1;
ERROR 42000: 'test.t1.f2' isn't in GROUP BY
select * from t1 group by f2;
ERROR 42000: 'test.t1.f1' isn't in GROUP BY
select * from t1 group by f1, f2;
f1 f2
select t1.f1,t.* from t1, t1 t group by 1;
ERROR 42000: 'test.t.f1' isn't in GROUP BY
drop table t1;
SET SQL_MODE = '';
CREATE TABLE t1(
id INT AUTO_INCREMENT PRIMARY KEY,
c1 INT NOT NULL,
c2 INT NOT NULL,
UNIQUE KEY (c2,c1));
INSERT INTO t1(c1,c2) VALUES (5,1), (4,1), (3,5), (2,3), (1,3);
SELECT * FROM t1 ORDER BY c1;
id c1 c2
5 1 3
4 2 3
3 3 5
2 4 1
1 5 1
SELECT * FROM t1 GROUP BY id ORDER BY c1;
id c1 c2
5 1 3
4 2 3
3 3 5
2 4 1
1 5 1
SELECT * FROM t1 GROUP BY id ORDER BY id DESC;
id c1 c2
5 1 3
4 2 3
3 3 5
2 4 1
1 5 1
SELECT * FROM t1 GROUP BY c2 ,c1, id ORDER BY c2, c1;
id c1 c2
2 4 1
1 5 1
5 1 3
4 2 3
3 3 5
SELECT * FROM t1 GROUP BY c2, c1, id ORDER BY c2 DESC, c1;
id c1 c2
3 3 5
5 1 3
4 2 3
2 4 1
1 5 1
SELECT * FROM t1 GROUP BY c2, c1, id ORDER BY c2 DESC, c1 DESC;
id c1 c2
3 3 5
4 2 3
5 1 3
1 5 1
2 4 1
SELECT * FROM t1 GROUP BY c2 ORDER BY c2, c1;
id c1 c2
1 5 1
4 2 3
3 3 5
SELECT * FROM t1 GROUP BY c2 ORDER BY c2 DESC, c1;
id c1 c2
3 3 5
4 2 3
1 5 1
SELECT * FROM t1 GROUP BY c2 ORDER BY c2 DESC, c1 DESC;
id c1 c2
3 3 5
4 2 3
1 5 1
DROP TABLE t1;
#
# Bug#27219: Aggregate functions in ORDER BY.
#
SET @save_sql_mode=@@sql_mode;
SET @@sql_mode='ONLY_FULL_GROUP_BY';
CREATE TABLE t1 (a INT, b INT, c INT DEFAULT 0);
INSERT INTO t1 (a, b) VALUES (3,3), (2,2), (3,3), (2,2), (3,3), (4,4);
CREATE TABLE t2 SELECT * FROM t1;
SELECT 1 FROM t1 ORDER BY COUNT(*);
1
1
SELECT 1 FROM t1 ORDER BY COUNT(*) + 1;
1
1
SELECT 1 FROM t1 ORDER BY COUNT(*) + a;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT 1 FROM t1 ORDER BY COUNT(*), 1;
1
1
SELECT 1 FROM t1 ORDER BY COUNT(*), a;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT 1 FROM t1 ORDER BY SUM(a);
1
1
SELECT 1 FROM t1 ORDER BY SUM(a + 1);
1
1
SELECT 1 FROM t1 ORDER BY SUM(a) + 1;
1
1
SELECT 1 FROM t1 ORDER BY SUM(a), b;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT a FROM t1 ORDER BY COUNT(b);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 ORDER BY (SELECT SUM(t2.a) FROM t2);
a
3
2
3
2
3
4
SELECT t1.a FROM t1 ORDER BY (SELECT SUM(t2.a), t2.a FROM t2);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 ORDER BY (SELECT SUM(t2.a) FROM t2 ORDER BY t2.a);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 ORDER BY (SELECT t2.a FROM t2 ORDER BY SUM(t2.b) LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1
WHERE t1.a = (SELECT t2.a FROM t2 ORDER BY SUM(t2.b) LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 GROUP BY t1.a
HAVING t1.a = (SELECT t2.a FROM t2 ORDER BY SUM(t2.a) LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 GROUP BY t1.a
HAVING t1.a IN (SELECT t2.a FROM t2 ORDER BY SUM(t1.b));
a
2
3
4
SELECT t1.a FROM t1 GROUP BY t1.a
HAVING t1.a IN (SELECT t2.a FROM t2 ORDER BY t2.a, SUM(t2.b));
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1 GROUP BY t1.a
HAVING t1.a > ANY (SELECT t2.a FROM t2 ORDER BY t2.a, SUM(t2.b));
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1
WHERE t1.a = (SELECT t2.a FROM t2 ORDER BY SUM(t1.b));
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(SUM(t1.b) + 1) FROM t2 ORDER BY SUM(t2.a) LIMIT 1);
1
1
1
1
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(SUM(t1.b) + t2.b) FROM t2 ORDER BY SUM(t2.a) LIMIT 1);
1
1
1
1
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(t1.b + t2.b) FROM t2 ORDER BY SUM(t2.a) LIMIT 1);
1
1
1
1
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(SUM(t1.b) + 1) FROM t2 ORDER BY t2.a LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(SUM(t1.b) + t2.b) FROM t2 ORDER BY t2.a LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT 1 FROM t1 GROUP BY t1.a
HAVING (SELECT AVG(t1.b + t2.b) FROM t2 ORDER BY t2.a LIMIT 1);
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT t1.a FROM t1
WHERE t1.a = (SELECT t2.a FROM t2 GROUP BY t2.a
ORDER BY SUM(t2.b), SUM(t1.b) LIMIT 1);
a
4
SELECT t1.a, SUM(t1.b) FROM t1
WHERE t1.a = (SELECT SUM(t2.b) FROM t2 GROUP BY t2.a
ORDER BY SUM(t2.b), SUM(t1.b) LIMIT 1)
GROUP BY t1.a;
a SUM(t1.b)
4 4
SELECT t1.a, SUM(t1.b) FROM t1
WHERE t1.a = (SELECT SUM(t2.b) FROM t2
ORDER BY SUM(t2.b) + SUM(t1.b) LIMIT 1)
GROUP BY t1.a;
a SUM(t1.b)
SELECT t1.a, SUM(t1.b) FROM t1
WHERE t1.a = (SELECT SUM(t2.b) FROM t2
ORDER BY SUM(t2.b + t1.a) LIMIT 1)
GROUP BY t1.a;
a SUM(t1.b)
SELECT t1.a FROM t1 GROUP BY t1.a
HAVING (1, 1) = (SELECT SUM(t1.a), t1.a FROM t2 LIMIT 1);
a
select avg (
(select
(select sum(outr.a + innr.a) from t1 as innr limit 1) as tt
from t1 as outr order by outr.a limit 1))
from t1 as most_outer;
avg (
(select
(select sum(outr.a + innr.a) from t1 as innr limit 1) as tt
from t1 as outr order by outr.a limit 1))
29.0000
select avg (
(select (
(select sum(outr.a + innr.a) from t1 as innr limit 1)) as tt
from t1 as outr order by count(outr.a) limit 1)) as tt
from t1 as most_outer;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
select (select sum(outr.a + t1.a) from t1 limit 1) as tt from t1 as outr order by outr.a;
tt
29
29
35
35
35
41
SET sql_mode=@save_sql_mode;
DROP TABLE t1, t2;
#
# BUG#38072: Wrong result: HAVING not observed in a query with aggregate
#
CREATE TABLE t1 (
pk int(11) NOT NULL AUTO_INCREMENT,
int_nokey int(11) NOT NULL,
int_key int(11) NOT NULL,
varchar_key varchar(1) NOT NULL,
varchar_nokey varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY int_key (int_key),
KEY varchar_key (varchar_key)
);
INSERT INTO t1 VALUES
(1,5,5, 'h','h'),
(2,1,1, '{','{'),
(3,1,1, 'z','z'),
(4,8,8, 'x','x'),
(5,7,7, 'o','o'),
(6,3,3, 'p','p'),
(7,9,9, 'c','c'),
(8,0,0, 'k','k'),
(9,6,6, 't','t'),
(10,0,0,'c','c');
explain SELECT COUNT(varchar_key) AS X FROM t1 WHERE pk = 8 having 'foo'='bar';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
SELECT COUNT(varchar_key) AS X FROM t1 WHERE pk = 8 having 'foo'='bar';
X
drop table t1;
End of 5.0 tests
CREATE TABLE t1 (a INT, b INT,
PRIMARY KEY (a),
KEY i2(a,b));
INSERT INTO t1 VALUES (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8);
INSERT INTO t1 SELECT a + 8,b FROM t1;
INSERT INTO t1 SELECT a + 16,b FROM t1;
INSERT INTO t1 SELECT a + 32,b FROM t1;
INSERT INTO t1 SELECT a + 64,b FROM t1;
INSERT INTO t1 SELECT a + 128,b FROM t1 limit 16;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
EXPLAIN SELECT a FROM t1 WHERE a < 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY,i2 PRIMARY 4 NULL 1 Using where; Using index
EXPLAIN SELECT a FROM t1 WHERE a < 2 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY,i2 PRIMARY 4 NULL 1 Using where; Using index
EXPLAIN SELECT a FROM t1 WHERE a < 2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY,i2 PRIMARY 4 NULL 1 Using where; Using index
EXPLAIN SELECT a FROM t1 IGNORE INDEX (PRIMARY,i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR JOIN (PRIMARY,i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (PRIMARY,i2) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,i2 PRIMARY 4 NULL 144 Using index; Using filesort
FLUSH STATUS;
SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (PRIMARY,i2) GROUP BY a;
SHOW SESSION STATUS LIKE 'Sort_scan%';
Variable_name Value
Sort_scan 1
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 144 Using index; Using filesort
FLUSH STATUS;
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
SHOW SESSION STATUS LIKE 'Sort_scan%';
Variable_name Value
Sort_scan 1
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY)
IGNORE INDEX FOR GROUP BY (i2) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,i2 PRIMARY 4 NULL 144 Using index
EXPLAIN SELECT a FROM t1 IGNORE INDEX (PRIMARY) IGNORE INDEX FOR ORDER BY (i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i2 9 NULL 144 Using index
EXPLAIN SELECT a FROM t1 FORCE INDEX (i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i2 9 NULL 144 Using index
EXPLAIN SELECT a FROM t1 USE INDEX ();
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1 USE INDEX () USE INDEX (i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1
FORCE INDEX (PRIMARY)
IGNORE INDEX FOR GROUP BY (i2)
IGNORE INDEX FOR ORDER BY (i2)
USE INDEX (i2);
ERROR HY000: Incorrect usage of USE INDEX and FORCE INDEX
EXPLAIN SELECT a FROM t1 USE INDEX (i2) USE INDEX ();
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i2 9 NULL 144 Using index
EXPLAIN SELECT a FROM t1 FORCE INDEX ();
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
EXPLAIN SELECT a FROM t1 IGNORE INDEX ();
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
EXPLAIN SELECT a FROM t1 USE INDEX FOR JOIN (i2)
USE INDEX FOR GROUP BY (i2) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 # PRIMARY,i2 i2 # NULL # #
EXPLAIN SELECT a FROM t1 FORCE INDEX FOR JOIN (i2)
FORCE INDEX FOR GROUP BY (i2) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,i2 i2 9 NULL 144 Using index
EXPLAIN SELECT a FROM t1 USE INDEX () IGNORE INDEX (i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1 IGNORE INDEX (i2) USE INDEX ();
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 144 NULL
EXPLAIN SELECT a FROM t1
USE INDEX FOR GROUP BY (i2)
USE INDEX FOR ORDER BY (i2)
USE INDEX FOR JOIN (i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i2 9 NULL 144 Using index
EXPLAIN SELECT a FROM t1
USE INDEX FOR JOIN (i2)
USE INDEX FOR JOIN (i2)
USE INDEX FOR JOIN (i2,i2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i2 9 NULL 144 Using index
EXPLAIN SELECT 1 FROM t1 WHERE a IN
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,i2 PRIMARY 4 NULL 144 Using where; Using index
1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 4 test.t1.a 1 NULL
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 144 NULL
CREATE TABLE t2 (a INT, b INT, KEY(a));
INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4);
EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 5 NULL 2 NULL
EXPLAIN SELECT a, SUM(b) FROM t2 IGNORE INDEX (a) GROUP BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL a NULL NULL NULL 4 Using temporary; Using filesort
EXPLAIN SELECT 1 FROM t2 WHERE a IN
(SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 5 NULL 4 Using where; Using index
1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 4 test.t2.a 1 NULL
2 MATERIALIZED t1 ALL NULL NULL NULL NULL 144 NULL
SHOW VARIABLES LIKE 'old';
Variable_name Value
old OFF
SET @@old = off;
ERROR HY000: Variable 'old' is a read only variable
DROP TABLE t1, t2;
CREATE TABLE t1(
a INT,
b INT NOT NULL,
c INT NOT NULL,
d INT,
UNIQUE KEY (c,b)
);
INSERT INTO t1 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
CREATE TABLE t2(
a INT,
b INT,
UNIQUE KEY(a,b)
);
INSERT INTO t2 VALUES (NULL, NULL), (NULL, NULL), (NULL, 1), (1, NULL), (1, 1), (1,2);
EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
SELECT c,b,d FROM t1 GROUP BY c,b,d;
c b d
1 1 50
3 1 4
3 2 40
EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b,d ORDER BY NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 NULL
SELECT c,b,d FROM t1 GROUP BY c,b,d ORDER BY NULL;
c b d
1 1 50
3 2 40
3 1 4
EXPLAIN SELECT c,b,d FROM t1 ORDER BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
SELECT c,b,d FROM t1 ORDER BY c,b,d;
c b d
1 1 50
3 1 4
3 2 40
EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL c NULL NULL NULL 3 Using filesort
SELECT c,b,d FROM t1 GROUP BY c,b;
c b d
1 1 50
3 1 4
3 2 40
EXPLAIN SELECT c,b FROM t1 GROUP BY c,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index c c 8 NULL 3 Using index
SELECT c,b FROM t1 GROUP BY c,b;
c b
1 1
3 1
3 2
EXPLAIN SELECT a,b from t2 ORDER BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL a 10 NULL 6 Using index
SELECT a,b from t2 ORDER BY a,b;
a b
NULL NULL
NULL NULL
NULL 1
1 NULL
1 1
1 2
EXPLAIN SELECT a,b from t2 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 10 NULL 6 Using index
SELECT a,b from t2 GROUP BY a,b;
a b
NULL NULL
NULL 1
1 NULL
1 1
1 2
EXPLAIN SELECT a from t2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 10 NULL 6 Using index
SELECT a from t2 GROUP BY a;
a
NULL
1
EXPLAIN SELECT b from t2 GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 10 NULL 6 Using index; Using temporary; Using filesort
SELECT b from t2 GROUP BY b;
b
NULL
1
2
DROP TABLE t1;
DROP TABLE t2;
CREATE TABLE t1 ( a INT, b INT );
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1;
c (SELECT a FROM t1 WHERE b = c)
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1
HAVING b = 10;
c (SELECT a FROM t1 WHERE b = c)
SELECT MAX(b) c, (SELECT a FROM t1 WHERE b = c)
FROM t1
HAVING b = 10;
ERROR 42S22: Reference 'c' not supported (reference to group function)
SET @old_sql_mode = @@sql_mode;
SET @@sql_mode='ONLY_FULL_GROUP_BY';
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1;
c (SELECT a FROM t1 WHERE b = c)
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1
HAVING b = 10;
ERROR 42000: Non-grouping field 'b' is used in HAVING clause
SELECT MAX(b) c, (SELECT a FROM t1 WHERE b = c)
FROM t1
HAVING b = 10;
ERROR 42S22: Reference 'c' not supported (reference to group function)
INSERT INTO t1 VALUES (1, 1);
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1;
c (SELECT a FROM t1 WHERE b = c)
1 1
INSERT INTO t1 VALUES (2, 1);
SELECT b c, (SELECT a FROM t1 WHERE b = c)
FROM t1;
ERROR 21000: Subquery returns more than 1 row
DROP TABLE t1;
SET @@sql_mode = @old_sql_mode;
SET @old_sql_mode = @@sql_mode;
SET @@sql_mode='ONLY_FULL_GROUP_BY';
CREATE TABLE t1(i INT);
INSERT INTO t1 VALUES (1), (10);
SELECT COUNT(i) FROM t1;
COUNT(i)
2
SELECT COUNT(i) FROM t1 WHERE i > 1;
COUNT(i)
1
DROP TABLE t1;
SET @@sql_mode = @old_sql_mode;
#
# Bug #45640: optimizer bug produces wrong results
#
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (4, 40), (1, 10), (2, 20), (2, 20), (3, 30);
# should return 4 ordered records:
SELECT (SELECT t1.a) aa, COUNT(DISTINCT b) FROM t1 GROUP BY aa;
aa COUNT(DISTINCT b)
1 1
2 1
3 1
4 1
SELECT (SELECT (SELECT t1.a)) aa, COUNT(DISTINCT b) FROM t1 GROUP BY aa;
aa COUNT(DISTINCT b)
1 1
2 1
3 1
4 1
SELECT (SELECT t1.a) aa, COUNT(DISTINCT b) FROM t1 GROUP BY aa+0;
aa COUNT(DISTINCT b)
1 1
2 1
3 1
4 1
# should return the same result in a reverse order:
SELECT (SELECT t1.a) aa, COUNT(DISTINCT b) FROM t1 GROUP BY -aa;
aa COUNT(DISTINCT b)
4 1
3 1
2 1
1 1
# execution plan should not use temporary table:
EXPLAIN EXTENDED
SELECT (SELECT t1.a) aa, COUNT(DISTINCT b) FROM t1 GROUP BY aa+0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 100.00 Using filesort
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select (/* select#2 */ select `test`.`t1`.`a`) AS `aa`,count(distinct `test`.`t1`.`b`) AS `COUNT(DISTINCT b)` from `test`.`t1` group by ((/* select#2 */ select `test`.`t1`.`a`) + 0)
EXPLAIN EXTENDED
SELECT (SELECT t1.a) aa, COUNT(DISTINCT b) FROM t1 GROUP BY -aa;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 100.00 Using filesort
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select (/* select#2 */ select `test`.`t1`.`a`) AS `aa`,count(distinct `test`.`t1`.`b`) AS `COUNT(DISTINCT b)` from `test`.`t1` group by -((/* select#2 */ select `test`.`t1`.`a`))
# should return only one record
SELECT (SELECT tt.a FROM t1 tt LIMIT 1) aa, COUNT(DISTINCT b) FROM t1
GROUP BY aa;
aa COUNT(DISTINCT b)
4 4
CREATE TABLE t2 SELECT DISTINCT a FROM t1;
# originally reported queries (1st two columns of next two query
# results should be same):
SELECT (SELECT t2.a FROM t2 WHERE t2.a = t1.a) aa, b, COUNT(DISTINCT b)
FROM t1 GROUP BY aa, b;
aa b COUNT(DISTINCT b)
1 10 1
2 20 1
3 30 1
4 40 1
SELECT (SELECT t2.a FROM t2 WHERE t2.a = t1.a) aa, b, COUNT( b)
FROM t1 GROUP BY aa, b;
aa b COUNT( b)
1 10 1
2 20 2
3 30 1
4 40 1
# ORDER BY for sure:
SELECT (SELECT t2.a FROM t2 WHERE t2.a = t1.a) aa, b, COUNT(DISTINCT b)
FROM t1 GROUP BY aa, b ORDER BY -aa, -b;
aa b COUNT(DISTINCT b)
4 40 1
3 30 1
2 20 1
1 10 1
SELECT (SELECT t2.a FROM t2 WHERE t2.a = t1.a) aa, b, COUNT( b)
FROM t1 GROUP BY aa, b ORDER BY -aa, -b;
aa b COUNT( b)
4 40 1
3 30 1
2 20 2
1 10 1
DROP TABLE t1, t2;
#
# Bug#52051: Aggregate functions incorrectly returns NULL from outer
# join query
#
CREATE TABLE t1 (a INT PRIMARY KEY);
CREATE TABLE t2 (a INT PRIMARY KEY);
INSERT INTO t2 VALUES (1), (2);
EXPLAIN SELECT MIN(t2.a) FROM t2 LEFT JOIN t1 ON t2.a = t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
SELECT MIN(t2.a) FROM t2 LEFT JOIN t1 ON t2.a = t1.a;
MIN(t2.a)
1
EXPLAIN SELECT MAX(t2.a) FROM t2 LEFT JOIN t1 ON t2.a = t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
SELECT MAX(t2.a) FROM t2 LEFT JOIN t1 ON t2.a = t1.a;
MAX(t2.a)
2
DROP TABLE t1, t2;
#
# Bug#55188: GROUP BY, GROUP_CONCAT and TEXT - inconsistent results
#
CREATE TABLE t1 (a text, b varchar(10));
INSERT INTO t1 VALUES (repeat('1', 1300),'one'), (repeat('1', 1300),'two');
EXPLAIN
SELECT SUBSTRING(a,1,10), LENGTH(a), GROUP_CONCAT(b) FROM t1 GROUP BY a;
id 1
select_type SIMPLE
table t1
type ALL
possible_keys NULL
key NULL
key_len NULL
ref NULL
rows 2
Extra Using filesort
SELECT SUBSTRING(a,1,10), LENGTH(a), GROUP_CONCAT(b) FROM t1 GROUP BY a;
SUBSTRING(a,1,10) LENGTH(a) GROUP_CONCAT(b)
1111111111 1300 one,two
EXPLAIN
SELECT SUBSTRING(a,1,10), LENGTH(a) FROM t1 GROUP BY a;
id 1
select_type SIMPLE
table t1
type ALL
possible_keys NULL
key NULL
key_len NULL
ref NULL
rows 2
Extra Using temporary; Using filesort
SELECT SUBSTRING(a,1,10), LENGTH(a) FROM t1 GROUP BY a;
SUBSTRING(a,1,10) LENGTH(a)
1111111111 1300
DROP TABLE t1;
#
# Bug#57688 Assertion `!table || (!table->write_set || bitmap_is_set(table->write_set, field
#
CREATE TABLE t1(f1 INT NOT NULL);
INSERT INTO t1 VALUES (16777214),(0);
SELECT COUNT(*) FROM t1 LEFT JOIN t1 t2
ON 1 WHERE t2.f1 > 1 GROUP BY t2.f1;
COUNT(*)
2
DROP TABLE t1;
#
# Bug#12798270: ASSERTION `!TAB->SORTED' FAILED IN JOIN_READ_KEY2
#
CREATE TABLE t1 (i int);
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (pk int PRIMARY KEY);
INSERT INTO t2 VALUES (10);
CREATE VIEW v1 AS SELECT t2.pk FROM t2;
SELECT v1.pk
FROM t1 LEFT JOIN v1 ON t1.i = v1.pk
GROUP BY v1.pk;
pk
NULL
DROP VIEW v1;
DROP TABLE t1,t2;
# End of Bug#12798270
#
# Bug#59839: Aggregation followed by subquery yields wrong result
#
CREATE TABLE t1 (
a INT,
b INT,
c INT,
KEY (a, b)
);
INSERT INTO t1 VALUES
( 1, 1, 1 ),
( 1, 2, 2 ),
( 1, 3, 3 ),
( 1, 4, 6 ),
( 1, 5, 5 ),
( 1, 9, 13 ),
( 2, 1, 6 ),
( 2, 2, 7 ),
( 2, 3, 8 );
EXPLAIN
SELECT a, AVG(t1.b),
(SELECT t11.c FROM t1 t11 WHERE t11.a = t1.a AND t11.b = AVG(t1.b)) AS t11c,
(SELECT t12.c FROM t1 t12 WHERE t12.a = t1.a AND t12.b = AVG(t1.b)) AS t12c
FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index a a 10 NULL 9 Using index
3 DEPENDENT SUBQUERY t12 ref a a 10 func,func 2 Using where
2 DEPENDENT SUBQUERY t11 ref a a 10 func,func 2 Using where
SELECT a, AVG(t1.b),
(SELECT t11.c FROM t1 t11 WHERE t11.a = t1.a AND t11.b = AVG(t1.b)) AS t11c,
(SELECT t12.c FROM t1 t12 WHERE t12.a = t1.a AND t12.b = AVG(t1.b)) AS t12c
FROM t1 GROUP BY a;
a AVG(t1.b) t11c t12c
1 4.0000 6 6
2 2.0000 7 7
DROP TABLE t1;
#
# Bug#11765254 (58200): Assertion failed: param.sort_length when grouping
# by functions
#
SET BIG_TABLES=1;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(0);
SELECT 1 FROM t1 GROUP BY IF(`a`,'','');
1
1
SELECT 1 FROM t1 GROUP BY TRIM(LEADING RAND() FROM '');
1
1
SELECT 1 FROM t1 GROUP BY SUBSTRING('',SLEEP(0),'');
1
1
Warnings:
Warning 1292 Truncated incorrect INTEGER value: ''
Warning 1292 Truncated incorrect INTEGER value: ''
Warning 1292 Truncated incorrect INTEGER value: ''
SELECT 1 FROM t1 GROUP BY SUBSTRING(SYSDATE() FROM 'K' FOR 'jxW<');
1
1
Warnings:
Warning 1292 Truncated incorrect INTEGER value: 'K'
Warning 1292 Truncated incorrect INTEGER value: 'jxW<'
Warning 1292 Truncated incorrect INTEGER value: 'K'
Warning 1292 Truncated incorrect INTEGER value: 'jxW<'
Warning 1292 Truncated incorrect INTEGER value: 'K'
Warning 1292 Truncated incorrect INTEGER value: 'jxW<'
DROP TABLE t1;
SET BIG_TABLES=0;
# End of 5.1 tests
#
# Bug#49771: Incorrect MIN (date) when minimum value is 0000-00-00
#
CREATE TABLE t1 (f1 int, f2 DATE);
INSERT INTO t1 VALUES (1,'2004-04-19'), (1,'0000-00-00'), (1,'2004-04-18'),
(2,'2004-05-19'), (2,'0001-01-01'), (3,'2004-04-10');
SELECT MIN(f2),MAX(f2) FROM t1;
MIN(f2) MAX(f2)
0000-00-00 2004-05-19
SELECT f1,MIN(f2),MAX(f2) FROM t1 GROUP BY 1;
f1 MIN(f2) MAX(f2)
1 0000-00-00 2004-04-19
2 0001-01-01 2004-05-19
3 2004-04-10 2004-04-10
DROP TABLE t1;
CREATE TABLE t1 ( f1 int, f2 time);
INSERT INTO t1 VALUES (1,'01:27:35'), (1,'06:11:01'), (2,'19:53:05'),
(2,'21:44:25'), (3,'10:55:12'), (3,'05:45:11'), (4,'00:25:00');
SELECT MIN(f2),MAX(f2) FROM t1;
MIN(f2) MAX(f2)
00:25:00 21:44:25
SELECT f1,MIN(f2),MAX(f2) FROM t1 GROUP BY 1;
f1 MIN(f2) MAX(f2)
1 01:27:35 06:11:01
2 19:53:05 21:44:25
3 05:45:11 10:55:12
4 00:25:00 00:25:00
DROP TABLE t1;
#End of test#49771
#
# Bug #58782
# Missing rows with SELECT .. WHERE .. IN subquery
# with full GROUP BY and no aggr
#
CREATE TABLE t1 (
pk INT NOT NULL,
col_int_nokey INT,
PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (10,7);
INSERT INTO t1 VALUES (11,1);
INSERT INTO t1 VALUES (12,5);
INSERT INTO t1 VALUES (13,3);
SELECT pk AS field1, col_int_nokey AS field2
FROM t1
WHERE col_int_nokey > 0
GROUP BY field1, field2;
field1 field2
10 7
11 1
12 5
13 3
CREATE TABLE where_subselect
SELECT pk AS field1, col_int_nokey AS field2
FROM t1
WHERE col_int_nokey > 0
GROUP BY field1, field2
;
SELECT *
FROM where_subselect
WHERE (field1, field2) IN (
SELECT pk AS field1, col_int_nokey AS field2
FROM t1
WHERE col_int_nokey > 0
GROUP BY field1, field2
);
field1 field2
10 7
11 1
12 5
13 3
DROP TABLE t1;
DROP TABLE where_subselect;
# End of Bug #58782
#
# Bug #11766429
# RE-EXECUTE OF PREPARED STATEMENT CRASHES IN ITEM_REF::FIX_FIELDS WITH
#
CREATE TABLE t1(a INT, KEY(a));
INSERT INTO t1 VALUES (0);
CREATE TABLE t2(b INT, KEY(b));
INSERT INTO t2 VALUES (0),(0);
PREPARE stmt FROM '
SELECT 1 FROM t2
LEFT JOIN t1 ON NULL
GROUP BY t2.b, t1.a
HAVING a <> 2';
EXECUTE stmt;
1
EXECUTE stmt;
1
DEALLOCATE PREPARE stmt;
DROP TABLE t1, t2;
# End of Bug #11766429
#
# Bug#12699645 SELECT SUM() + STRAIGHT_JOIN QUERY MISSES ROWS
#
CREATE TABLE t1 (
pk INT, col_int_key INT,
col_varchar_key VARCHAR(1), col_varchar_nokey VARCHAR(1)
);
INSERT INTO t1 VALUES
(10,7,'v','v'),(11,0,'s','s'),(12,9,'l','l'),(13,3,'y','y'),(14,4,'c','c'),
(15,2,'i','i'),(16,5,'h','h'),(17,3,'q','q'),(18,1,'a','a'),(19,3,'v','v'),
(20,6,'u','u'),(21,7,'s','s'),(22,5,'y','y'),(23,1,'z','z'),(24,204,'h','h'),
(25,224,'p','p'),(26,9,'e','e'),(27,5,'i','i'),(28,0,'y','y'),(29,3,'w','w');
CREATE TABLE t2 (
pk INT, col_int_key INT,
col_varchar_key VARCHAR(1), col_varchar_nokey VARCHAR(1),
PRIMARY KEY (pk)
);
INSERT INTO t2 VALUES
(1,4,'b','b'),(2,8,'y','y'),(3,0,'p','p'),(4,0,'f','f'),(5,0,'p','p'),
(6,7,'d','d'),(7,7,'f','f'),(8,5,'j','j'),(9,3,'e','e'),(10,188,'u','u'),
(11,4,'v','v'),(12,9,'u','u'),(13,6,'i','i'),(14,1,'x','x'),(15,5,'l','l'),
(16,6,'q','q'),(17,2,'n','n'),(18,4,'r','r'),(19,231,'c','c'),(20,4,'h','h'),
(21,3,'k','k'),(22,3,'t','t'),(23,7,'t','t'),(24,6,'k','k'),(25,7,'g','g'),
(26,9,'z','z'),(27,4,'n','n'),(28,4,'j','j'),(29,2,'l','l'),(30,1,'d','d'),
(31,2,'t','t'),(32,194,'y','y'),(33,2,'i','i'),(34,3,'j','j'),(35,8,'r','r'),
(36,4,'b','b'),(37,9,'o','o'),(38,4,'k','k'),(39,5,'a','a'),(40,5,'f','f'),
(41,9,'t','t'),(42,3,'c','c'),(43,8,'c','c'),(44,0,'r','r'),(45,98,'k','k'),
(46,3,'l','l'),(47,1,'o','o'),(48,0,'t','t'),(49,189,'v','v'),(50,8,'x','x'),
(51,3,'j','j'),(52,3,'x','x'),(53,9,'k','k'),(54,6,'o','o'),(55,8,'z','z'),
(56,3,'n','n'),(57,9,'c','c'),(58,5,'d','d'),(59,9,'s','s'),(60,2,'j','j'),
(61,2,'w','w'),(62,5,'f','f'),(63,8,'p','p'),(64,6,'o','o'),(65,9,'f','f'),
(66,0,'x','x'),(67,3,'q','q'),(68,6,'g','g'),(69,5,'x','x'),(70,8,'p','p'),
(71,2,'q','q'),(72,120,'q','q'),(73,25,'v','v'),(74,1,'g','g'),(75,3,'l','l'),
(76,1,'w','w'),(77,3,'h','h'),(78,153,'c','c'),(79,5,'o','o'),(80,9,'o','o'),
(81,1,'v','v'),(82,8,'y','y'),(83,7,'d','d'),(84,6,'p','p'),(85,2,'z','z'),
(86,4,'t','t'),(87,7,'b','b'),(88,3,'y','y'),(89,8,'k','k'),(90,4,'c','c'),
(91,6,'z','z'),(92,1,'t','t'),(93,7,'o','o'),(94,1,'u','u'),(95,0,'t','t'),
(96,2,'k','k'),(97,7,'u','u'),(98,2,'b','b'),(99,1,'m','m'),(100,5,'o','o');
EXPLAIN SELECT SUM(alias2.col_varchar_nokey) , alias2.pk AS field2 FROM t1 AS alias1
STRAIGHT_JOIN t2 AS alias2 ON alias2.pk = alias1.col_int_key WHERE alias1.pk
GROUP BY field2 ORDER BY alias1.col_int_key,alias2.pk ;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE alias1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort
1 SIMPLE alias2 eq_ref PRIMARY PRIMARY 4 test.alias1.col_int_key 1 NULL
SELECT SUM(alias2.col_varchar_nokey) , alias2.pk AS field2 FROM t1 AS alias1
STRAIGHT_JOIN t2 AS alias2 ON alias2.pk = alias1.col_int_key WHERE alias1.pk
GROUP BY field2 ORDER BY alias1.col_int_key,alias2.pk ;
SUM(alias2.col_varchar_nokey) field2
0 1
0 2
0 3
0 4
0 5
0 6
0 7
0 9
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 'f'
Warning 1292 Truncated incorrect DOUBLE value: 'e'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'f'
Warning 1292 Truncated incorrect DOUBLE value: 'y'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'b'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'd'
Warning 1292 Truncated incorrect DOUBLE value: 'f'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'b'
Warning 1292 Truncated incorrect DOUBLE value: 'e'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
Warning 1292 Truncated incorrect DOUBLE value: 'p'
DROP TABLE t1,t2;
#
# Bug#12798270: ASSERTION `!TAB->SORTED' FAILED IN JOIN_READ_KEY2
#
CREATE TABLE t1 (i int);
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (pk int PRIMARY KEY);
INSERT INTO t2 VALUES (10);
CREATE VIEW v1 AS SELECT t2.pk FROM t2;
SELECT v1.pk
FROM t1 LEFT JOIN v1 ON t1.i = v1.pk
GROUP BY v1.pk;
pk
NULL
DROP VIEW v1;
DROP TABLE t1,t2;
# End of Bug#12798270
#
# Bug#12837714: ADDITIONAL NULL IN 5.6 ON GROUPED SELECT
#
CREATE TABLE t1 (vc varchar(1), INDEX vc_idx (vc)) ;
INSERT INTO t1 VALUES (NULL), ('o'), (NULL), ('p'), ('c');
FLUSH TABLE t1;
SELECT vc FROM t1 GROUP BY vc;
vc
NULL
c
o
p
DROP TABLE t1;
# End of Bug#12837714
#
# Bug#12578908: SELECT SQL_BUFFER_RESULT OUTPUTS TOO MANY
# ROWS WHEN GROUP IS OPTIMIZED AWAY
#
CREATE TABLE t1 (col1 int, col2 int) ;
INSERT INTO t1 VALUES (10,1),(11,7);
CREATE TABLE t2 (col1 int, col2 int) ;
INSERT INTO t2 VALUES (10,8);
EXPLAIN SELECT SQL_BUFFER_RESULT t2.col2 FROM t2 JOIN t1 ON t1.col1 GROUP BY t2.col2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 system NULL NULL NULL NULL 1 Using temporary
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
SELECT SQL_BUFFER_RESULT t2.col2 FROM t2 JOIN t1 ON t1.col1 GROUP BY t2.col2;
col2
8
EXPLAIN SELECT t2.col2 FROM t2 JOIN t1 ON t1.col1 GROUP BY t2.col2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 system NULL NULL NULL NULL 1 NULL
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
SELECT t2.col2 FROM t2 JOIN t1 ON t1.col1 GROUP BY t2.col2;
col2
8
DROP TABLE t1,t2;
#
# Bug#11761078: 53534: INCORRECT 'SELECT SQL_BIG_RESULT...'
# WITH GROUP BY ON DUPLICATED FIELDS
#
CREATE TABLE t1(
col1 int,
UNIQUE INDEX idx (col1)
);
INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),
(11),(12),(13),(14),(15),(16),(17),(18),(19),(20);
EXPLAIN SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
FROM t1 GROUP BY field1, field2;;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx idx 5 NULL 7 Using index for group-by
FLUSH STATUS;
SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
FROM t1 GROUP BY field1, field2;;
field1 field2
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
SHOW SESSION STATUS LIKE 'Sort_scan%';
Variable_name Value
Sort_scan 0
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT SQL_BIG_RESULT col1 AS field1, col1 AS field2
FROM v1
GROUP BY field1, field2;
field1 field2
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
SELECT SQL_BIG_RESULT tbl1.col1 AS field1, tbl2.col1 AS field2
FROM t1 as tbl1, t1 as tbl2
GROUP BY field1, field2
LIMIT 3;
field1 field2
1 1
1 2
1 3
DROP VIEW v1;
DROP TABLE t1;
#
# Bug#13422961: WRONG RESULTS FROM SELECT WITH AGGREGATES AND
# IMPLICIT GROUPING + MYISAM OR MEM
#
CREATE TABLE it (
pk INT NOT NULL,
col_int_nokey INT NOT NULL,
PRIMARY KEY (pk)
) ENGINE=MyISAM;
CREATE TABLE ot (
pk int(11) NOT NULL,
col_int_nokey int(11) NOT NULL,
PRIMARY KEY (pk)
) ENGINE=MyISAM;
INSERT INTO ot VALUES (10,8);
SELECT col_int_nokey, MAX( pk )
FROM ot
WHERE (8, 1) IN ( SELECT pk, COUNT( col_int_nokey ) FROM it );
col_int_nokey MAX( pk )
NULL NULL
DROP TABLE it,ot;
#
# Bug#13430588: WRONG RESULT FROM IMPLICITLY GROUPED QUERY WITH
# CONST TABLE AND NO MATCHING ROWS
#
CREATE TABLE t1 (i INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (j INT) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1),(2);
SELECT i, j, COUNT(i) FROM t1 JOIN t2 WHERE j=3;
i j COUNT(i)
1 NULL 0
DROP TABLE t1,t2;
#
# BUG#13541761: WRONG RESULTS ON CORRELATED SUBQUERY +
# AGGREGATE FUNCTION + MYISAM OR MEMORY
#
CREATE TABLE t1 (
a varchar(1)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a'), ('b');
CREATE TABLE t2 (
a varchar(1),
b int(11)
) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('a',1);
EXPLAIN SELECT (SELECT MAX(b) FROM t2 WHERE t2.a != t1.a) as MAX
FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 NULL
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1 NULL
SELECT (SELECT MAX(b) FROM t2 WHERE t2.a != t1.a) as MAX
FROM t1;
MAX
NULL
1
DROP TABLE t1,t2;
# Bug 11923239 - ERROR WITH CORRELATED SUBQUERY IN VIEW WITH
# ONLY_FULL_GROUP_BY SQL MODE
CREATE TABLE t1 (
pk INT,
col_int_key INT,
col_int_nokey INT,
col_varchar_key VARCHAR(10),
col_varchar_nokey VARCHAR(10),
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key)
);
INSERT INTO t1 VALUES (), ();
# In GROUP BY, aliases are printed as aliases.
EXPLAIN EXTENDED SELECT alias1.col_int_nokey AS field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
) AS field2
FROM t1 AS alias1
GROUP BY field1, field2;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
2 DEPENDENT SUBQUERY alias2 index NULL col_int_key 5 NULL 2 100.00 Using where; Using index
Warnings:
Note 1276 Field or reference 'test.alias1.col_varchar_key' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.alias1.col_varchar_nokey' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select `test`.`alias1`.`col_int_nokey` AS `field1`,(/* select#2 */ select `test`.`alias2`.`col_int_key` from `test`.`t1` `alias2` where (`test`.`alias1`.`col_varchar_key` <= `test`.`alias1`.`col_varchar_nokey`)) AS `field2` from `test`.`t1` `alias1` group by `field1`,`field2`
# In GROUP BY, expressions are printed as expressions.
EXPLAIN EXTENDED SELECT alias1.col_int_nokey AS field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
) AS field2
FROM t1 AS alias1
GROUP BY field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY alias1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
3 DEPENDENT SUBQUERY alias2 index NULL col_int_key 5 NULL 2 100.00 Using where; Using index
2 DEPENDENT SUBQUERY alias2 index NULL col_int_key 5 NULL 2 100.00 Using where; Using index
Warnings:
Note 1276 Field or reference 'test.alias1.col_varchar_key' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.alias1.col_varchar_nokey' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.alias1.col_varchar_key' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'test.alias1.col_varchar_nokey' of SELECT #3 was resolved in SELECT #1
Note 1003 /* select#1 */ select `test`.`alias1`.`col_int_nokey` AS `field1`,(/* select#2 */ select `test`.`alias2`.`col_int_key` from `test`.`t1` `alias2` where (`test`.`alias1`.`col_varchar_key` <= `test`.`alias1`.`col_varchar_nokey`)) AS `field2` from `test`.`t1` `alias1` group by `field1`,(/* select#3 */ select `test`.`alias2`.`col_int_key` from `test`.`t1` `alias2` where (`test`.`alias1`.`col_varchar_key` <= `test`.`alias1`.`col_varchar_nokey`))
# Aliased expression in GROUP BY in a view.
CREATE VIEW v1 AS SELECT alias1.col_int_nokey AS field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
) AS field2
FROM t1 AS alias1
GROUP BY field1, field2;
# In GROUP BY, aliases are printed as aliases.
SHOW CREATE VIEW v1;
View Create View character_set_client collation_connection
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `alias1`.`col_int_nokey` AS `field1`,(select `alias2`.`col_int_key` from `t1` `alias2` where (`alias1`.`col_varchar_key` <= `alias1`.`col_varchar_nokey`)) AS `field2` from `t1` `alias1` group by `field1`,`field2` latin1 latin1_swedish_ci
SET @old_sql_mode = @@sql_mode;
SET @@sql_mode='ONLY_FULL_GROUP_BY';
SELECT alias1.col_int_nokey AS field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
) AS field2
FROM t1 AS alias1
GROUP BY field1, field2;
field1 field2
NULL NULL
# The SELECT above has been accepted, and v1 was created
# using the same SELECT as above, so SELECTing from v1
# should be accepted.
SELECT * FROM v1;
field1 field2
NULL NULL
# Here is why in GROUP BY we print aliases of subqueries as
# aliases: below, "GROUP BY (subquery)" confuses
# ONLY_FULL_GROUP_BY, it causes an error though the subquery of
# GROUP BY and of SELECT list are the same. Fixing this would
# require implementing Item_subselect::eq(). It's not worth
# the effort because:
# a) GROUP BY (subquery) is non-SQL-standard so is likely of
# very little interest to users of ONLY_FULL_GROUP_BY
# b) as the user uses ONLY_FULL_GROUP_BY, he wants to have the
# same subquery in GROUP BY and SELECT list, so can give the
# subquery an alias in the SELECT list and use this alias in
# GROUP BY, thus avoiding the problem.
SELECT alias1.col_int_nokey AS field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
) AS field2
FROM t1 AS alias1
GROUP BY field1,
(SELECT alias2.col_int_key
FROM t1 AS alias2
WHERE alias1.col_varchar_key <= alias1.col_varchar_nokey
);
ERROR 42000: 'test.alias1.col_varchar_key' isn't in GROUP BY
DROP VIEW v1;
SET @@sql_mode = @old_sql_mode;
# Verify that if an alias is used in GROUP BY/ORDER BY it
# is printed as an alias, not as the expression.
CREATE TABLE t2(a INT);
INSERT INTO t2 VALUES(3),(4);
EXPLAIN EXTENDED SELECT
pk AS foo, col_int_key AS bar, (SELECT a FROM t2 WHERE a=t1.pk) AS baz
FROM t1
GROUP BY foo, col_int_key, baz ORDER BY pk, bar, (SELECT a FROM t2 WHERE a=t1.pk);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.pk' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.t1.pk' of SELECT #3 was resolved in SELECT #1
Note 1003 /* select#1 */ select `t1`.`pk` AS `foo`,`t1`.`col_int_key` AS `bar`,(/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = `t1`.`pk`)) AS `baz` from `test`.`t1` group by `foo`,`t1`.`col_int_key`,`baz` order by `t1`.`pk`,`bar`,(/* select#3 */ select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = `t1`.`pk`))
EXPLAIN EXTENDED SELECT
pk AS foo, col_int_key AS foo, (SELECT a FROM t2 WHERE a=t1.pk) AS foo
FROM t1
GROUP BY pk, col_int_key, (SELECT a FROM t2 WHERE a=t1.pk)
ORDER BY pk, col_int_key, (SELECT a FROM t2 WHERE a=t1.pk);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
4 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.pk' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.t1.pk' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'test.t1.pk' of SELECT #4 was resolved in SELECT #1
Note 1003 /* select#1 */ select `t1`.`pk` AS `foo`,`t1`.`col_int_key` AS `foo`,(/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = `t1`.`pk`)) AS `foo` from `test`.`t1` group by `t1`.`pk`,`t1`.`col_int_key`,(/* select#3 */ select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = `t1`.`pk`)) order by `t1`.`pk`,`t1`.`col_int_key`,(/* select#4 */ select `test`.`t2`.`a` from `test`.`t2` where (`test`.`t2`.`a` = `t1`.`pk`))
DROP TABLE t1,t2;
#
# Bug#13591138 - ASSERTION NAME && !IS_AUTOGENERATED_NAME IN
# ITEM::PRINT_FOR_ORDER ON EXPLAIN EXT
#
CREATE TABLE t1 (
pk int(11) NOT NULL AUTO_INCREMENT,
col_datetime_key datetime NOT NULL,
col_varchar_key varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY col_datetime_key (col_datetime_key),
KEY col_varchar_key (col_varchar_key)
);
CREATE TABLE t2 (
pk int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (pk)
);
CREATE TABLE t3 (
pk int(11) NOT NULL AUTO_INCREMENT,
col_varchar_key varchar(1) NOT NULL,
PRIMARY KEY (pk),
KEY col_varchar_key (col_varchar_key)
);
CREATE VIEW view1 AS SELECT * FROM t1;
EXPLAIN EXTENDED
SELECT
alias1.col_datetime_key AS field1
FROM (
view1 AS alias1,
t3 AS alias2
)
WHERE (
(SELECT MIN(SQ1_alias1.pk)
FROM t2 AS SQ1_alias1
)
) OR (alias1.col_varchar_key = alias2.col_varchar_key
AND alias1.col_varchar_key = 'j'
) AND alias1.pk IS NULL
GROUP BY
field1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No matching min/max row
Warnings:
Note 1003 /* select#1 */ select NULL AS `field1` from `test`.`t1` join `test`.`t3` `alias2` where 0 group by `field1`
DROP TABLE t1,t2,t3;
DROP VIEW view1;
CREATE TABLE t1 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
col_varchar_nokey varchar(1) DEFAULT NULL,
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
CREATE TABLE t2 (
col_int_key int(11) DEFAULT NULL,
col_varchar_key varchar(1) DEFAULT NULL,
col_varchar_nokey varchar(1) DEFAULT NULL,
KEY col_int_key (col_int_key),
KEY col_varchar_key (col_varchar_key,col_int_key)
);
CREATE ALGORITHM=MERGE VIEW view1 AS
SELECT CONCAT( table1.col_varchar_nokey , table2.col_varchar_key ) AS
field1
FROM
t2 AS table1 JOIN t1 AS table2
ON table2.col_varchar_nokey = table1.col_varchar_key
AND
table2.col_varchar_key >= table1.col_varchar_nokey
ORDER BY field1
;
EXPLAIN EXTENDED SELECT * FROM view1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 /* select#1 */ select concat(NULL,NULL) AS `field1` from `test`.`t2` `table1` join `test`.`t1` `table2` where 0 order by concat(NULL,NULL)
DROP TABLE t1,t2;
DROP VIEW view1;
CREATE TABLE t1 (col_varchar_nokey varchar(1) DEFAULT NULL);
INSERT INTO t1 VALUES ('v'),('c');
EXPLAIN EXTENDED SELECT (SELECT 150) AS field5
FROM (SELECT * FROM t1) AS alias1
GROUP BY field5;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 2 100.00 NULL
3 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 NULL
Warnings:
Note 1249 Select 2 was reduced during optimization
Note 1003 /* select#1 */ select 150 AS `field5` from (/* select#3 */ select `test`.`t1`.`col_varchar_nokey` AS `col_varchar_nokey` from `test`.`t1`) `alias1` group by `field5`
DROP TABLE t1;
#
# BUG#12626418 "only_full_group_by wrongly allows column in order by"
#
SET @old_sql_mode = @@sql_mode;
SET @@sql_mode='ONLY_FULL_GROUP_BY';
create table t1(a int, b int);
select a from t1 group by b;
ERROR 42000: 'test.t1.a' isn't in GROUP BY
select 1 from t1 group by b;
1
select 1 from t1 group by b order by a;
ERROR 42000: 'test.t1.a' isn't in GROUP BY
select a from t1 group by b order by b;
ERROR 42000: 'test.t1.a' isn't in GROUP BY
drop table t1;
CREATE TABLE t1 (pk int, i1 int, v1 varchar(1), primary key (pk));
INSERT INTO t1 VALUES (0,2,'b'),(1,4,'a'),(2,0,'a'),(3,7,'b'),(4,7,'c');
SELECT a1.v1,a2.v1 FROM t1 AS a1 JOIN t1 AS a2 ON a2.pk = a1.i1 group by
a1.v1,a2.v1 ORDER BY a1.i1,a2.pk,a2.v1 ASC;
ERROR 42000: 'test.a2.pk' isn't in GROUP BY
SELECT a1.v1,a2.v1 FROM t1 AS a1 JOIN t1 AS a2 ON a2.pk = a1.i1 group by
a1.v1,a2.v1 ORDER BY a2.v1 ASC;
v1 v1
b a
a b
a c
DROP TABLE t1;
CREATE TABLE t1 (pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) NOT
NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT
NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key
(col_varchar_key,col_int_key));
CREATE TABLE t2 (pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) NOT
NULL, col_varchar_key varchar(1) NOT NULL, col_varchar_nokey varchar(1) NOT
NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key), KEY col_varchar_key
(col_varchar_key,col_int_key));
SELECT SUM(alias2.col_varchar_nokey) , alias2.pk AS field2 FROM t1 AS alias1
STRAIGHT_JOIN t2 AS alias2 ON alias2.pk = alias1.col_int_key WHERE alias1.pk
group by field2 ORDER BY alias1.col_int_key,alias2.pk ;
ERROR 42000: 'test.alias1.col_int_key' isn't in GROUP BY
DROP TABLE t1,t2;
CREATE TABLE t1 (pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) NOT
NULL, col_datetime_key datetime NOT NULL, col_varchar_key varchar(1) NOT
NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY
col_int_key (col_int_key), KEY col_datetime_key (col_datetime_key), KEY
col_varchar_key (col_varchar_key,col_int_key));
CREATE TABLE t2 (pk int(11) NOT NULL AUTO_INCREMENT, col_int_key int(11) NOT
NULL, col_datetime_key datetime NOT NULL, col_varchar_key varchar(1) NOT
NULL, col_varchar_nokey varchar(1) NOT NULL, PRIMARY KEY (pk), KEY
col_int_key (col_int_key), KEY col_datetime_key (col_datetime_key), KEY
col_varchar_key (col_varchar_key,col_int_key));
SELECT alias2.col_varchar_key AS field1 ,
COUNT(DISTINCT alias1.col_varchar_nokey), alias2.pk AS field4
FROM t1 AS alias1
RIGHT JOIN t2 AS alias2 ON alias2.pk = alias1.col_int_key
GROUP BY field1 , field4
ORDER BY alias1.col_datetime_key ;
ERROR 42000: 'test.alias1.col_datetime_key' isn't in GROUP BY
DROP TABLE t1,t2;
create table t1 (a int, b int);
select count(*) > 3 from t1 group by a order by b;
ERROR 42000: 'test.t1.b' isn't in GROUP BY
create table t2 (a int, b int);
select a from t2 group by a order by (select a from t1 order by t2.b);
ERROR 42000: 'test.t2.b' isn't in GROUP BY
SET @@sql_mode = @old_sql_mode;
DROP TABLE t1,t2;
create table t1 (branch varchar(40), id int);
select count(*) from t1 group by branch having
branch<>'mumbai' order by id desc,branch desc limit 100;
count(*)
select branch, count(*)/max(id) from t1 group by branch
having (branch<>'mumbai' OR count(*)<2)
order by id desc,branch desc limit 100;
branch count(*)/max(id)
SET @@sql_mode='ONLY_FULL_GROUP_BY';
select count(*) from t1 group by branch having
branch<>'mumbai' order by id desc,branch desc limit 100;
ERROR 42000: 'test.t1.id' isn't in GROUP BY
select branch, count(*)/max(id) from t1 group by branch
having (branch<>'mumbai' OR count(*)<2)
order by id desc,branch desc limit 100;
ERROR 42000: 'test.t1.id' isn't in GROUP BY
DROP TABLE t1;
create table t1 (a int, b int);
insert into t1 values (1, 2), (1, 3), (null, null);
select sum(a), count(*) from t1 group by a;
sum(a) count(*)
NULL 1
2 2
select round(sum(a)), count(*) from t1 group by a;
round(sum(a)) count(*)
NULL 1
2 2
select ifnull(a, 'xyz') from t1 group by a;
ifnull(a, 'xyz')
xyz
1
DROP TABLE t1;
SET @@sql_mode = @old_sql_mode;
#
# BUG#12640437: USING SQL_BUFFER_RESULT RESULTS IN A
# DIFFERENT QUERY OUTPUT
#
CREATE TABLE t1 (
a int,
b varchar(1),
KEY (b,a)
);
INSERT INTO t1 VALUES (1,NULL),(0,'a'),(1,NULL),(0,'a');
EXPLAIN SELECT SQL_BUFFER_RESULT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 9 NULL 2 Using where; Using index for group-by; Using temporary
SELECT SQL_BUFFER_RESULT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
MIN(a) b
0 a
EXPLAIN SELECT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 9 NULL 2 Using where; Using index for group-by
SELECT MIN(a), b FROM t1 WHERE t1.b = 'a' GROUP BY b;
MIN(a) b
0 a
DROP TABLE t1;
#
# Bug #12888306 MISSING ROWS FOR SELECT >ALL (SUBQUERY WITHOUT ROWS)
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0);
SELECT 1 FROM t1 WHERE 1 > ALL(SELECT 1 FROM t1 WHERE a);
1
1
DROP TABLE t1;