create table t1 (
th int primary key,
un int,
de int,
rb varchar(1000),
al longtext,
key(de),
unique(rb))
engine=ndb;
insert into t1 values (1, 1, 1, repeat('O', 1000), repeat('L', 60000));
insert into t1 values (2, 2, 2, repeat('W', 999), repeat('B', 60001));
insert into t1 values (3, 3, 3, repeat('P', 998), repeat('P', 60002));
insert into t1 values (4, 4, 4, repeat('Q', 997), repeat('E', 60003));
insert into t1 values (5, 5, 5, repeat('E', 996), repeat('A', 60004));
select th, un, de, length(rb), length(al)
from t1
where th in (2,4)
order by th;
th un de length(rb) length(al)
2 2 2 999 60001
4 4 4 997 60003
select th, un, de, length(rb), length(al)
from t1
where rb
in (repeat('O', 1000), repeat('Q', 997))
order by th;
th un de length(rb) length(al)
1 1 1 1000 60000
4 4 4 997 60003
select th, un, de, length(rb), length(al)
from t1
where de between 3 and 5
order by th;
th un de length(rb) length(al)
3 3 3 998 60002
4 4 4 997 60003
5 5 5 996 60004
select th, un, de, length(rb), length(al)
from t1
order by th;
th un de length(rb) length(al)
1 1 1 1000 60000
2 2 2 999 60001
3 3 3 998 60002
4 4 4 997 60003
5 5 5 996 60004
update t1
set un=6, de=6, rb= repeat('S', 995), al = repeat('O', 60005)
where th = 1;
update t1
set un=7, de=7, al = repeat('F', 60006)
where rb = repeat('W', 999);
update t1
set un= un + 5, rb = repeat('U', 1000 - un), al = repeat('U', 60000 + un)
where de >= 3 and de <= 5;
select th, un, de, length(rb), length(al)
from t1
order by th;
th un de length(rb) length(al)
1 6 6 995 60005
2 7 7 999 60006
3 8 3 992 60008
4 9 4 991 60009
5 10 5 990 60010
alter table t1 add column extra varchar(2000);
Warnings:
Warning 1478 Converted FIXED field to DYNAMIC to enable on-line ADD COLUMN
update t1 set extra = repeat(rb, 2);
select th, un, de, length(rb), length(al), length(extra)
from t1
order by th;
th un de length(rb) length(al) length(extra)
1 6 6 995 60005 1990
2 7 7 999 60006 1998
3 8 3 992 60008 1984
4 9 4 991 60009 1982
5 10 5 990 60010 1980
select th, un, de, length(rb), length(al), length(extra)
from t1
where extra in (
repeat('U', 2000),
repeat('U', 1998),
repeat('U', 1996),
repeat('U', 1994),
repeat('U', 1992),
repeat('U', 1990),
repeat('U', 1988),
repeat('U', 1986),
repeat('U', 1984),
repeat('U', 1982),
repeat('U', 1980),
repeat('U', 1978),
repeat('U', 1976),
repeat('U', 1974),
repeat('U', 1972),
repeat('U', 1970),
repeat('U', 1968),
repeat('U', 1966),
repeat('U', 1964))
order by th;
th un de length(rb) length(al) length(extra)
3 8 3 992 60008 1984
4 9 4 991 60009 1982
5 10 5 990 60010 1980
drop table t1;