Question

我们有两张桌子：

UserTable

userid   username
1        test
2        test2
3        test3


UserStatus

statusid userid status
1        1      1
2        1      3
3        1      7
4        2      1

现在我们需要一个用户列表，其中不的用户具有状态3。

有任何想法吗？

Answer 1

您可以使用NOT EXISTS：

select u.userid,
  u.username
from usertable u
where not exists (select s.userid
                  from userstatus s
                  where s.status = 3
                    and u.userid = s.userid);

请参阅SQL Fiddle with Demo

Answer 2

您可以使用NOT IN：

SELECT usertable.*
FROM usertable
WHERE userid NOT IN (SELECT userid from userstatus where status=3)

请参阅小提琴here。

Answer 3

SELECT username from UserTable
WHERE userid NOT IN (SELECT userid FROM UserStatus WHERE status = 3)

Answer 4

SELECT * FROM UserTable
WHERE userid NOT IN
(SELECT userid FROM UserStatus WHERE status = 3)

sql连接与where和1-n连接

4 个答案: