MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('070503','070501','070502','070521','070552','070524','070562','070569','070571','070500','070563','070550','070575','070567','070564','070553','070561','070551','070556','070555','070572','070573','070576','070574','070559','070566','070557','070570','070565','070577','070581','070523','070525','070584','070582','070526','070578','070585','070579','070586','070587','070588','0705J3','0705J1','0705J2') 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