添加一個內部連接到mySQL GROUP_CONCAT語句

Question

問題：我有一個GROUP_CONCAT查詢按預期工作，但我想使concat成爲聯接答案，而不是原始ID字段。

目前查詢：

SELECT user.user_id, user.user, GROUP_CONCAT(user_roles.roleID separator ', ') roles 
FROM user 
JOIN user_roles ON user.user_ID = user_roles.user_ID 
GROUP BY users.user_ID, users.user 

給出了結果：

+----------+---------+----------------------------+ 
| user_ID | user | roles     | 
+----------+---------+----------------------------+ 
|  1 | Smith | 1, 3     | 
+----------+---------+----------------------------+ 
|  2 | Jones | 1, 2, 3     | 
+----------+---------+----------------------------+ 

期望的結果：

+----------+---------+----------------------------+ 
| user_ID | user | roles     | 
+----------+---------+----------------------------+ 
|  1 | Smith | Admin, Other   | 
+----------+---------+----------------------------+ 
|  2 | Jones | Admin, Staff, Other  | 
+----------+---------+----------------------------+ 

用戶表：

+----------+---------+ 
| user_ID | user | 
+----------+---------+ 
|  1 | Smith | 
+----------+---------+ 
|  2 | Jones | 
+----------+---------+ 

* users_roles表：*

+----------+---------+ 
| user_ID | role_ID | 
+----------+---------+ 
|  1 | 1  | 
+----------+---------+ 
|  2 | 1  | 
+----------+---------+ 
|  2 | 2  | 
+----------+---------+ 
|  2 | 3  | 
+----------+---------+ 
|  1 | 3  | 
+----------+---------+ 

角色表：

+----------+-----------+ 
| role_ID | role_name | 
+----------+-----------+ 
|  1 | Admin | 
+----------+-----------+ 
|  2 | Staff | 
+----------+-----------+ 
|  3 | Other | 
+----------+-----------+ 

Answer 1

嘗試以下查詢

SELECT user.user_id, user.user, GROUP_CONCAT(roles.role_name separator ', ') roles 
FROM user 
JOIN user_roles ON user.user_ID = user_roles.user_ID 
JOIN roles ON user_roles.role_ID= user_roles.role_ID 
GROUP BY users.user_ID, users.user