MySQL：具有LEFT JOIN的GROUP_CONCAT

采用：

   SELECt t.*,          x.combinedsolutions     FROM TICKETS tLEFT JOIN (SELECt s.ticket_id,       GROUP_CONCAt(s.soution) AS combinedsolutions  FROM SOLUTIONS s          GROUP BY s.ticket_id) x ON x.ticket_id = t.ticket_id

备用：

   SELECt t.*,          (SELECT GROUP_CONCAt(s.soution)  FROM SOLUTIONS s  WHERe s.ticket_id = t.ticket_id) AS combinedsolutions     FROM TICKETS t