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  t1.id,
            t1.title,
            t2.content,
            t2.is_best,
            t1.view FROM ay_question t1  LEFT JOIN ay_question_answer t2 ON t2.q_id = t1.id WHERE(t1.status=1 AND t2.status=1 AND t2.is_best=1) GROUP BY id  ORDER BY t1.view DESC,t1.creat_time desc  LIMIT 10