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','601高等数学三','806统计综合','705分析化学（含仪器分析）','808卫生微生物学','615微生物学','865有机化学','普通化学','环境卫生学','639烹饪综合（烹饪工艺学、烹饪化学）','882食品分析','610环境卫生学','801普通化学','931食品生物化学','603数学与程序设计','809生物信息学基础','615食品微生物学','817食品生物化学') order by kskm desc limit -2300,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu.php on line 331
