sql语句中asc和desc有什么区别

问题描述

精选答案

SQL 语句中, asc是指定列按升序排列，desc则是指定列按降序排列。

排序子句语法：order by 列名 asc/desc

1、按列n2的升序排列

select * from tt order by n2 asc;

select * from tt order by n2 desc;

3、复合排序，先按列n1升序排列，再按n2降序排列

select * from tt order by n1 asc,n2 desc;