[转] mysql分组取每组前几条记录(排名) ? ? ? ?参照这篇文章http://www.cnblogs.com/JulyZhang/archive/2011/02/12/1952213.html，拿出每个分类中的前几记录，写成的mysql如下： select a.id,name,type from adpos a where 3 (select count(*) from tablename
[转] mysql分组取每组前几条记录(排名)? ? ? ?参照这篇文章http://www.cnblogs.com/JulyZhang/archive/2011/02/12/1952213.html，拿出每个分类中的前几记录，写成的mysql如下：
select a.id,name,type from adpos a where 3 > (select count(*) from tablename where type = a.type and id < a.id ) order by a.type,a.id
? ? ? ?mysql居然不会支持top ,比如select top 3 id from table order by type,id,就不行。
? ?
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