MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('100200','100205','100201','100202','100208','100210','100211','100212','100253','100207','100214','100216','100217','100270','100213','100236','100206','100203','100282','100280','100289','100204','100218','100286','100287','100252','100288','100215','100277','100255','100271','100276','100283','100278','100263','100290','100279','100259','100262','100295','100296','100229','100261','100293','100233','100219','100251','100254','100284','100281','100258','100264','100257','100250','100256','100260','100291','100298','100266','100267','100269','100268','100292','100232','100274','100275','100273','100294','100231','100230','100265','100297','100299','100222','100223','100235','100221','100220','100238','1002Z4','100239','100237','100225','1002J2','100224','1002Z8','1002Z1','1002Z2','1002Z3','1002Z5') order by kskm desc limit -1100,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330