mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
39 lines
928 B
Text
39 lines
928 B
Text
drop table if exists t1,t2,t3,t4;
|
|
create table t1 (a int);
|
|
create table t2 (a int, b int);
|
|
create table t3 (a int);
|
|
create table t4 (a int, b int);
|
|
insert into t1 values (2);
|
|
insert into t2 values (1,7),(2,7);
|
|
insert into t4 values (4,8),(3,8),(5,9);
|
|
select (select a from t1 where t1.a=t2.a), a from t2;
|
|
(select a from t1 where t1.a=t2.a) a
|
|
NULL 1
|
|
2 2
|
|
select (select a from t1 where t1.a=t2.b), a from t2;
|
|
(select a from t1 where t1.a=t2.b) a
|
|
NULL 1
|
|
NULL 2
|
|
select (select a from t1), a from t2;
|
|
(select a from t1) a
|
|
2 1
|
|
2 2
|
|
select (select a from t3), a from t2;
|
|
(select a from t3) a
|
|
NULL 1
|
|
NULL 2
|
|
select * from t2 where t2.a=(select a from t1);
|
|
a b
|
|
2 7
|
|
insert into t3 values (6),(7),(3);
|
|
select * from t2 where t2.b=(select a from t3 order by 1 limit 1);
|
|
a b
|
|
1 7
|
|
2 7
|
|
select * from t2 where t2.b=(select a from t3 order by 1 limit 1)
|
|
union (select * from t4 order by a limit 2) limit 3;
|
|
a b
|
|
1 7
|
|
2 7
|
|
3 8
|
|
drop table t1,t2,t3,t4;
|