Unknown column 'mnum' in 'order clause'<br>select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,titlepic,newstime,video,fg,xrq,price,ruanjian,downfen,filesize from ***_ecms_map where classid in (635,1661,1662,1663,1664,1665,1666,1667,1668,1669,1670,1804) order by istop desc,mnum desc,downfen desc,totaldown desc limit 0,40