查询问题 select instrid from schoolwhere stdid in(select stdid from grade group by stdname having count(*)>1) 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 select a.instridfrom school ainner join (select STDID,num=count(*) from GRADE group by STDID having count(*)>1)bon a.STDID=b.STDID select * from school where stdname in( select n.stdname from grade m , school n where m.stdid = n.stdid group by n.stdname having count(*) > 1) 菜鸟求解!11 该列没有包含在聚合函数或 GROUP BY 子句中,这个错误怎么解决啊 请帮忙请教: 表数据要求同步的问题, 我该如何办? 存储过程新手疑惑~望高手帮忙解答下~ 事务完整性问题,各位大虾要仗义阿! 求救:MySQL安装失败…… 日志恢复数据库及日志查看 设a="(xyz)=*",b="(x+z)*y".问应该对a串进行哪些运算才能得到b串。 请各位帮忙啊,我有急用啊 SQL的性能如此不堪??? 数据库的备灾容灾设计 查出最近两周的数据
from school a
inner join
(select STDID,num=count(*) from GRADE group by STDID having count(*)>1)b
on a.STDID=b.STDID
select * from school where stdname in
(
select n.stdname from grade m , school n where m.stdid = n.stdid group by n.stdname having count(*) > 1
)