MySQL的简单查询语句
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发布时间:2019年08月06日

概述

一:查询所有数据

select from Info 查所有数据
select Code,Name from Info 查特定列

二:根据条件查

select from Info where Code='p001' 一个条件查询
select from Info where Code='p001' and Nation='n001' 多条件 并关系 查询
select from Info where Name='胡军' or Nation='n001' 多条件 或关系 查询
select from Car where Price>=50 and Price<=60 范围查询
select from Car where Price between 50 and 60 范围查询

三:模糊查询

select from Car where Name like '%型' %通配符代表任意多个字符
select from Car where Name like '%奥迪%' 通配符代表任意一个字符
select * from Car where Name like '马%'

四:排序

select from Car order by Price asc 按照价格升序排列
select from Car order by Price desc 按照价格降序排列
select from Car order by Price,Oil 按照两列进行排序,前面的为主要的

五:统计函数(聚合函数)

select count(Code) from Car 查询表中有多少条数据
select max(Price) from Car 取价格的最大值
select min(Price) from Car 取价格的最小值
select sum(Price) from Car 取价格的总和
select avg(Price) from Car 取价格的平均值

六:分组查询

select Brand from Car group by Brand having count()>2 查询所有系列中数量大于2的

七:分页查询

select * from Car limit 0,5 跳过几条数据取几条数据

八:去重查询

select distinct Brand from Car
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