selecta.*,b.SumPointfromExpert_Topic_Indexa,( selectTopicID,Sum(Point)asSumPointfromexpert_reply_index wherePostUserName='ghj1976' GroupbyTopicID HavingSum(Point)0 )asb wherea.TopicID=b.TopicID 这里其实就是把一个查询的结果放到
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。
