[英]Find records from one table which don't exist in another & users mapped from third table
我是SQL的新手,请尝试动手。
寻找一种有效的方法来获取用户表中存在但临时表中不存在的用户(*)
有三个表:
Temp:
member_no | name
User:
endUserId | name
Login:
member_no | endUserId
我尝试了这个但没有用:
SELECT *
FROM User LEFT OUTER JOIN
Temp
ON User.endUserId = (SELECT TOP 1 e.endUserId
FROM User e JOIN
LOGIN l
ON e.endUserId = l.endUserId
WHERE l.username = Temp.member_no
)
提前致谢
如果您希望不处于临时状态的用户not exists
或not in
not exists
,请注意:
select u.*
from user u
where not exists (select 1
from temp t join
login l
on t.memberno = l.memberno
where l.endUserId = u.endUserId
);
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