Question

tbl user
    +--------+--------+
    | UserID | Name   |
    +--------+--------+
    | 1      | John   |
    | 2      | Anny   |
    | 3      | Andy   |
    | 4      | Tom    |
    +--------+--------+

tbl rol
    +--------+--------+
    | RolID | Name    |
    +--------+--------+
    | 1      | Manager|
    | 2      | Lead   |
    | 3      | Tester |
    | 4      | Develop|
    +--------+--------+


tbl user_rol
    +--------+--------+
    | UserID | RolID  |
    +--------+--------+
    | 1      | 1      |
    | 1      | 2      |
    | 1      | 4      |
    | 2      | 1      |
    | 3      | 3      |
    +--------+--------+

我有一个参数列表1,2,4

SELECT u.UserID,Name
  FROM [user] u
  WHERE u.UserID in(
    SELECT ur2.UserID 
    FROM user_rol ur2
    WHERE ur2.ROlID IN(1,2,4) 
    GROUP BY ur2.UserID
    HAVING COUNT(DISTINCT ur2.RolID)=3
    )

回复将是：

 +--------+--------+
 | UserID | Name   |
 +--------+--------+
 | 1      | John   |

但如果我的参数将是1,2,3,4不起作用，但我需要响应像以前一样

问题在于计数我不知道中间表user_rol中存在多少。

Answer 1

很难从你这个问题中得知，但在我看来，我希望输出在user_rol表中列出的具有多个角色的任何用户。以下是您将如何做到这一点：

SELECT user.userid, user.name
FROM user
INNER JOIN user_rol
ON user.userid = user_rol.userid
GROUP BY user.userid, user.name
HAVING COUNT(*) > 1

在这里测试：https://github.com/oisdk/SwiftSequence

sql内连接在哪里和

1 个答案: