============================================================================= Mysql_Query : select * from morning_goods_table where goods_class = '0' and approval_date > '0' and ( substring(goods_category,1,4) = '0104' or substring(goods_mcategory1,1,4) = '0104' or substring(goods_mcategory2,1,4) = '0104' or substring(goods_mcategory3,1,4) = '0104' or substring(goods_mcategory4,1,4) = '0104' or substring(goods_mcategory5,1,4) = '0104' ) and goods_grant <= 0 order by register_date desc limit -50, 50 Mysql_Error : Mysql Error Num : =============================================================================