select companyname,companynumber,username,homepage,mainproduct,subproduct,usergrade,phone,country,area,companyaddress,companyphone,starttime,endtime,valid,wechatid,workfeerate from userTable  where 1  and ( usergrade = '3' or usergrade = '4')  order by companyname asc, username asc  limit 0, <br>You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1