Mysql 学习之路（三）Mysql基础知识之数据过滤

1.order_by

select * from products order_by salary desc;(倒叙)

select * from products order_by salary asc;

2.利用正则表达式

select * from products where name regexp ‘.000‘;

select * from products where name regexp ‘[123] 000‘;

3.利用函数

select upper(name) from products ;

select * from products where Year(order_date) = 2020 and Month(order_date) = 5;

select avg(salary) from products;(平均值)

select count(*) from products;（计数）

select max(salary) as min_salary from products;（最大值）

select sum(salary) as sum_salary from products;（求和）

Mysql 学习之路（三）Mysql基础知识之数据过滤

原文：https://www.cnblogs.com/peterWXM/p/12997854.html