h*g
2 楼
我怎么绝得是一样的啊
i*a
4 楼
Performance slightly different. Not exist is slightly faster.
h*x
5 楼
向李泉致敬!
i*a
6 楼
can also read this:
http://weblogs.sqlteam.com/mladenp/archive/2007/05/18/60210.aspx
【在 h*****g 的大作中提到】
: 我怎么绝得是一样的啊
http://weblogs.sqlteam.com/mladenp/archive/2007/05/18/60210.aspx
【在 h*****g 的大作中提到】
: 我怎么绝得是一样的啊
r*g
8 楼
not exists, not in 在performance上差别巨大。
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