Hinzufügen eines inneren Joins zu mySQL GROUP_CONCAT-Anweisung

Question

Problem: Ich habe eine GROUP_CONCAT-Abfrage, die wie vorgesehen funktioniert, außer ich möchte die concat eine verknüpfte Antwort, nicht die rohe ID-Feld.

Aktuelle Abfrage:

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 

Gibt Ergebnis:

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

Wunschergebnis:

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

Benutzertabelle:

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

* users_roles Tabelle: *

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

Rollen Tabelle:

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

Answer 1

versuchen die folgende Abfrage

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