limit.result 1.28 KB
Newer Older
unknown's avatar
unknown committed
1 2 3 4 5 6
drop table if exists t1;
create table t1 (a int primary key, b int not null);
insert into t1 () values ();
insert into t1 values (1,1),(2,1),(3,1);
update t1 set a=4 where b=1 limit 1;
select * from t1;
7 8 9 10 11
a	b
0	0
4	1
2	1
3	1
unknown's avatar
unknown committed
12 13
update t1 set b=2 where b=1 limit 2;
select * from t1;
14 15 16 17 18
a	b
0	0
4	2
2	2
3	1
unknown's avatar
unknown committed
19 20
update t1 set b=4 where b=1;
select * from t1;
21 22 23 24 25
a	b
0	0
4	2
2	2
3	4
unknown's avatar
unknown committed
26 27
delete from t1 where b=2 limit 1;
select * from t1;
28 29 30 31
a	b
0	0
2	2
3	4
unknown's avatar
unknown committed
32 33
delete from t1 limit 1;
select * from t1;
34 35 36
a	b
2	2
3	4
unknown's avatar
unknown committed
37 38
drop table t1;
create table t1 (i int);
39
insert into t1 (i) values(1),(1),(1);
unknown's avatar
unknown committed
40 41 42 43 44
delete from t1 limit 1;
update t1 set i=2 limit 1;
delete from t1 limit 0;
update t1 set i=3 limit 0;
select * from t1;
unknown's avatar
unknown committed
45 46 47
i
2
1
unknown's avatar
unknown committed
48
drop table t1;
49 50
select 0 limit 0;
0
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
CREATE TABLE t1(id int auto_increment primary key, id2 int, index(id2));
INSERT INTO t1 (id2) values (0),(0),(0);
DELETE FROM t1 WHERE id=1;
INSERT INTO t1 SET id2=0;
SELECT * FROM t1;
id	id2
4	0
2	0
3	0
DELETE FROM t1 WHERE id2 = 0 ORDER BY id LIMIT 1;
SELECT * FROM t1;
id	id2
4	0
3	0
DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1;
SELECT * FROM t1;
id	id2
3	0
DROP TABLE t1;
unknown's avatar
unknown committed
70 71 72 73 74 75 76 77 78
create table t1 (a integer);
insert into t1 values (1);
select 1 as a from t1 union all select 1 from dual limit 1;
a
1
(select 1 as a from t1) union all (select 1 from dual) limit 1;
a
1
drop table t1;