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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) |
报错:
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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) |
以下可通过:
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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 ; |
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;
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UPDATE test.tb_vobile a set a.name = ‘111 ‘ WHERE a.id = (select max(id) id from test.tb_vobile) |
报错:
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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 |
以下可通过:
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2
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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 ; |
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;
标签:
原文地址:http://www.cnblogs.com/whowhere/p/5666814.html