时间:2021-07-01 10:21:17 帮助过:5人阅读
比如:
?1 2 3 4 |
UPDATE test.tb_vobile a
set a.name = ‘111 ‘
WHERE
a.id = (select max(id) id from test.tb_vobile)
|
报错:
?1 2 3 4 5 6 7 |
[SQL]UPDATE test.tb_vobile a
set a.name = ‘111 ‘
WHERE
a.id = (select max(id) id from test.tb_vobile)
|
以下可通过:
?1 2 3 4 5 6 7 8 9 10 11 |
UPDATE test.tb_vobile a
join
(select max(id) id from test.tb_vobile) b
on a.id = b.id
set a.name = ‘123 ‘ ;
或
UPDATE test.tb_vobile a ,(select max(id) id from test.tb_vobile) b
set a.name = ‘321 ‘
WHERE
a.id = b.id ;
|
说明:
1、update 时,更新的表不能在set和where中用于子查询;
2、update 时,可以对多个表进行更新(sqlserver不行);
如:update ta a,tb b set a.Bid=b.id ,b.Aid=a.id;
3、update 后面可以做任意的查询,这个作用等同于from;
1 2 3 4 |
UPDATE test.tb_vobile a
set a.name = ‘111 ‘
WHERE
a.id = (select max(id) id from test.tb_vobile)
|
报错:
?1 2 3 4 5 6 7 |
[SQL]UPDATE test.tb_vobile a
set a.name = ‘111 ‘
WHERE
a.id = (select max(id) id from test.tb_vobile)
[Err] 1093 - You can ‘t specify target table ‘ a‘ for update in FROM clause
|
以下可通过:
?1 2 3 4 5 6 7 8 9 10 11 |
UPDATE test.tb_vobile a
join
(select max(id) id from test.tb_vobile) b
on a.id = b.id
set a.name = ‘123 ‘ ;
或
UPDATE test.tb_vobile a ,(select max(id) id from test.tb_vobile) b
set a.name = ‘321 ‘
WHERE
a.id = b.id ;
|
说明:
1、update 时,更新的表不能在set和where中用于子查询;
2、update 时,可以对多个表进行更新(sqlserver不行);
如:update ta a,tb b set a.Bid=b.id ,b.Aid=a.id;
3、update 后面可以做任意的查询,这个作用等同于from;
MySQL数据库update更新子查询
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