MySQL - Vyberte sloupec z jiné tabulky pomocí referenční tabulky

Zkuste:

    SELECT a.name,a.email, GROUP_CONCAT(c.code)
      FROM users a 
      JOIN code_to_user_ref b ON a.user_id = b.user_id
      JOIN codes c ON b.code_id = c.code_id 
  GROUP BY a.name,a.email

Výsledek by byl:

| NAME |        EMAIL |  CODE/S OWNED |
|------|--------------|---------------|
| jane | [email protected] |        Vb#4%6 |
|  joe |  [email protected] | [email protected]$5,[email protected]$ |
| john | [email protected] |        Bn%6&8 |

Zde je SQLFiddle .