MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and kskm in ('101思想政治理论','201英语一','609高等数学','902理论力学或920材料力学','302数学二','802理论力学','301数学一','801普通物理','813力学综合','301数学一或302数学二','814材料科学基础','802普通物理或813力学综合','920材料力学','838计算机力学基础','807材料力学','613理论力学') order by kskm desc limit -1650,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu.php on line 331
