SqlServer: Top N per Group

在sqlserver中可以这样显示分组前N个成员, 关键在row_number, partition

select * from
(select schoolmember_id, row_number() over(partition by school_id order by schoolmember_id ) as number from schoolmember) as a
where a.number < 3

posted @ 2011-03-22 18:04 dragonpig 阅读(...) 评论(...) 编辑 收藏