MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('120100','120135','120144','120136','120139','120163','120165','120168','120123','120126','120129','120158','120141','120124','120160','120121','120157','120132','120142','120127','120133','120189','120197','120131','120169','120185','120122','120187','120178','120150','120151','120198','120193','120196','120188','120119','120186','120184','120182','120138','120159','120154','120153','120143','120148','120180','120140','120164','120152','120171','120147','120192','120191','120183','120174','120166','120173','120176','120134','120172','120130','120194','120195','120199','120190','120155','120137','1201Z4','120181','120162','120115','120118','120116','120114','120117','1201Z8','1201J2','120145','120167','1201Z1','1201Z5','1201Z6','1201J3') 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