MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('070100','070101','070102','070103','070104','070160','070168','070170','070152','070105','070151','070173','070175','070176','070177','070172','070183','070182','070184','070167','070165','070157','070181','070163','070174','070178','070150','070169','070161','070158','070179','070180','070156','070159','070166','070186','070185','070188','070187','70103','70167','70101','70105','701J1','70102','70104','70152','70172','70100','0701J2','70160','0701Z1') order by kskm desc limit -850,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330