一个SQL语句获得某人参与的帖子及在该帖得分总和 |
select a.*,b.SumPoint from Expert_Topic_Index a,( select TopicID, Sum(Point) as SumPoint from expert_reply_index where PostUserName = ghj1976 Group by TopicID Having Sum(Point) > 0 ) as b where a.TopicID = b.TopicID 这里其实就是把一个查询的结果放到新的一个查询中了 。 另外 Having 对分组结果进行的查询 。 |