文章简介:DISTINCT 是 MySQL 中用于删除结果集中重复行的运算符。它保留同一列或一组列中唯一的值。用法:1. 与 SELECT 语句一起使用,从表中选择唯一值。2. 语法:SELECT DISTINCT column_name(s) FROM table_name。3. 例如:SELECT DISTINCT name FROM customers;
文章简介:解决当distinct和join同时存在distinct失效问题。$sql = 'select distinct(ontopid),gb.id as id,f.id as fid,g.id as gid,g.*,gb.*,f.* from pk_groupbuy gb left join pk_ontop as o on o.ontopid=gb.id left join pk_goods g on gb.goodsid=