摘要: 概述 WITH AS短语,也叫做子查询部分(subquery factoring),是用来定义一个SQL片断,该SQL片断会被整个SQL语句所用到。这个语句,即为公用表表达式(CTE,common table expression),比如with A as (select * from class) 阅读全文
posted @ 2020-07-28 00:02 johnny233 阅读(50) 评论(0) 推荐(0) 编辑