查找排除当前最大、最小salary之后的员工的平均工资avg_salary。

查找排除当前最大、最小salary之后的员工的平均工资avg_salary。
CREATE TABLE `salaries` ( `emp_no` int(11) NOT NULL,
`salary` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`from_date`));

select avg(salary) as avg_salary from salaries  where salary not in (select max(salary)from salaries) and salary not in (select min(salary) from salaries);

输出格式: