微擎學習隨記_數據庫操做命令

微擎學習隨記_數據庫操做命令 二表連查並去掉NULL和0 $sql = 'select sum(b.level) as sumCore, count(b.level) as dataCount from  ' . tablename('ccnb_shop_order') . 'a left join '. tablename('ccnb_shop_order_comment')  . " b on

>>阅读原文<<