学习关于聚合FUNCTION（count(*|fieldname)）
发布时间：2020-12-13 20:40:41 所属栏目：百科 来源：网络整理
导读：-----------------结果集为刚好分组后每组中记录数为3个 select * from b t where (select count(*) from b where a = t.a and b t.b) 3 and exists(select count(*) from b where a=t.a group by a having count(*)=3) go ----------------结晶集为分组后每
|
-----------------结果集为刚好分组后每组中记录数为3个 select * from b t where (select count(*) from b where a = t.a and b > t.b) <3 and exists(select count(*) from b where a=t.a group by a having count(*)>=3) go ----------------结晶集为分组后每组中记录数为》=3个 select * from b t where exists(select count(*) from b where a=t.a group by a having count(*)>=3) （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |