[英]Find records from one table which don't exist in another & users mapped from third table
我是SQL的新手,請嘗試動手。
尋找一種有效的方法來獲取用戶表中存在但臨時表中不存在的用戶(*)
有三個表:
Temp:
member_no | name
User:
endUserId | name
Login:
member_no | endUserId
我嘗試了這個但沒有用:
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
)
提前致謝
如果您希望不處於臨時狀態的用戶not exists
或not in
not exists
,請注意:
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
);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.