摘要:        
1.分组前3条数据select * from (SELECT a.categoryid,a.infoid from information a where (select count(*) from information b where a.CategoryID =b.categoryid and a.infoid>b.infoid)<3order by a.categoryid,infoid) c where c.CategoryID in (28) ;    阅读全文
posted @ 2012-11-14 13:09
zhengguoqing
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