MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('100506','100507','100509','100508','100511','100505','100512','100503','100501','100551','100502','100504','100526','100522','100523','100524','100521','100525','100527','100510','100530','100533','100535','100500','100547','100537','100538','100536','100546','100545','100528','100529','100513','100531','100541','100542','100543','100544','100549','100532','100539','100548','100550','100552','100514','100553','100557','100554','100556','100540','1005J2','100555','100534','100558','100559','100560','100561','100563','100562','1005J1','1005J4') order by kskm desc limit -700,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330