谈NOT IN和Exists

表1: test001

select * from test001

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alt="" />

表2：test002

select * from test002

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" alt="" />

执行语句：

select * from test002 where id not in(select id from test001)

居然没有结果？

原因：因为test001表中有id为空

解决方法：

方法一：

select * from test002 where id not in(select id from test001 where id is not null)

方法二：

select * from test002 a where not exists (select 1 from test001 b where b.id=a.id)

参考网址:
http://x-spirit.iteye.com/blog/615603