between 的用法

between【在某个范围】

--查找工资在a到b之间（包括a,b）的所有员工的信息
select * from emp
    where sal >= 1500 and sal <= 3000
--等价于
select * from emp
    where sal between 1500 and 3000

--查找工资在小于或大于之间的所有员工的信息
select * from emp
    where sal < 1500 and sal > 3000
--等价于
select * from emp
    where sal not between 1500 and 3000