执行SQL发生错误！错误：Can't create/write to file '/tmp/#sql_149e_0.MYI' (Errcode: 28 - No space left on device)，语句：SELECT  aq.id,aq.title,aqa.content,aq.update_date FROM ay_question aq  LEFT JOIN ay_question_answer aqa ON aqa.q_id = aq.id WHERE(aq.status=1 AND aqa.status=1) GROUP BY aqa.q_id  ORDER BY aq.update_date DESC  LIMIT 0,10