SELECT p1.id, p1.pic_url,p1.point_name,p2.pid,p1.point_hit,p2.discuss_content FROM d_points AS p1 JOIN ( SELECT pid,discuss_content FROM d_discuss ) AS p2 WHERE p2.pid = p1.id and p1.pic_url !='/images/dadipedia.gif' order by point_hit desc limit 0,4<br>MYSQL(PDO) ERROR:Got error 28 from storage engine