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 ac.* FROM ay_content ac JOIN ay_content_sort acs ON acs.scode = ac.scode LEFT JOIN ay_content_watch acw ON ac.id = acw.content_id WHERE(ac.acode='cn' AND ac.status='1' AND acw.brand_py='epos' ) ORDER BY ac.date DESC LIMIT 10