MS sqlserver 查询有关问题，

MS sqlserver 查询问题，请教高手！
SELECT distinct(a.bm_id),COUNT(DISTINCT(user_id)) as usercount,bm_count,
 ((COUNT(DISTINCT(user_id)))*10000/bm_count) as per
 FROM DoInfo AS p INNER JOIN BmInfo AS a ON a.bm_id=p.bm_id group by 
 a.bm_id ,a.bm_temp ,bm_count,user_id having a.bm_temp= 1 and user_id>0 order by per desc
查询语句是这样子的，也就是查询参与人数的百分比！这样查询出来的是所有的，我想知道怎么能够查询到前3条呢？
前面加top 3 会和 distinct有冲突！至于这个usr_id>0是因为我在表里面插入了一组空数据（为了页面显示）！

------解决方案--------------------------------------------------------
select top 3 * from
(
SELECT distinct(a.bm_id),COUNT(DISTINCT(user_id)) as usercount,bm_count,
 ((COUNT(DISTINCT(user_id)))*10000/bm_count) as per
 FROM DoInfo AS p INNER JOIN BmInfo AS a ON a.bm_id=p.bm_id group by
 a.bm_id ,a.bm_temp ,bm_count,user_id having a.bm_temp= 1 and user_id>0
) as t order by t.per desc;
这样呢
------解决方案--------------------------------------------------------

探讨

SELECT distinct(a.bm_id),COUNT(DISTINCT(user_id)) as usercount,bm_count,
((COUNT(DISTINCT(user_id)))*10000/bm_count) as per
FROM DoInfo AS p INNER JOIN BmInfo AS a ON a.bm_id=p.bm_id group by
……