sql_case when_根据不同用户类型统计收藏记录数
Select x.usertype,count(x.favorityid) from
(
Select
Case When A.Usertype=B.Loginid Then B.Nickname
When A.Usertype=C.Loginid Then C.Nickname
When A.Usertype=D.Loginid Then D.Nickname
End As usertype,a.favorityid
(
Select
Case When A.Usertype=B.Loginid Then B.Nickname
When A.Usertype=C.Loginid Then C.Nickname
When A.Usertype=D.Loginid Then D.Nickname
End As usertype,a.favorityid
From O_Classfavorityinfo A,E_Logininfo B,e_parentlogininfo C,E_Teacherlogininfo D
Where A.Usertype=B.Loginid Or A.Usertype=C.Loginid Or A.Usertype=D.Loginid
) x
group by x.usertype
Where A.Usertype=B.Loginid Or A.Usertype=C.Loginid Or A.Usertype=D.Loginid
) x
group by x.usertype
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/9240380/viewspace-668497/ ，如需转载，请注明出处，否则将追究法律责任。
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