SELECT m.uid, m.username, m.regdate, mx.avatar, md.postnum, md.commentnum, md.diggnum, md.burynum 
						FROM pb_members m 
						LEFT JOIN pb_memberdata md 
						ON m.uid = md.uid 
						LEFT JOIN pb_memberexp mx 
						ON m.uid = mx.uid WHERE m.groupid = -1 ORDER BY md.currency DESC LIMIT 0, 12Error writing file '/tmp/MYbWqSq9' (Errcode: 28)