比如:
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2
3
4
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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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1
2
3
4
5
6
7
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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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1
2
3
4
5
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7
8
9
10
11
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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 '
;
或
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
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
|
以下可通過:
|
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 ;
|
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;
