MySQL數據庫update更新子查詢


比如:

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UPDATE test.tb_vobile a
set a.name = '111 '
WHERE
a.id = (select max(id) id from test.tb_vobile)

報錯:

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[SQL]UPDATE test.tb_vobile a
set a.name = '111 '
WHERE
a.id = (select max(id) id from test.tb_vobile)
 

以下可通過:

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UPDATE test.tb_vobile a
join
(select max(id) id from test.tb_vobile) b
on a.id = b.id
set a.name = '123 ' ;
 
UPDATE test.tb_vobile a ,(select max(id) id from test.tb_vobile) b
set a.name = '321 '
WHERE
a.id = b.id ;

說明:

1、update 時,更新的表不能在set和where中用於子查詢;
2、update 時,可以對多個表進行更新(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詢,這個作用等同於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)

報錯:

?
1
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3
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[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

 

以下可通過:

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UPDATE test.tb_vobile a
join
(select max(id) id from test.tb_vobile) b
on a.id = b.id
set a.name = '123 ' ;
 
UPDATE test.tb_vobile a ,(select max(id) id from test.tb_vobile) b
set a.name = '321 '
WHERE
a.id = b.id ;

說明:

1、update 時,更新的表不能在set和where中用於子查詢;
2、update 時,可以對多個表進行更新(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詢,這個作用等同於from;


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