MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('070302','070300','070301','070303','070304','070305','070373','070353','070359','070371','070360','070350','070354','070355','070383','070358','070363','070367','070372','070377','070375','070356','070369','070378','070322','070357','070361','070376','070381','070382','070374','070384','070368','070362','070351','070352','070364','070385','070380','070366','070388','070387','070323','0703J1','070379','070389','70303','70300','70301','70302','70304','0703J2','0703Z2','0703J4') order by kskm desc limit -1900,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330