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

排除最大和最小薪水

select avg(salary) from salaries where salary 
not in 
(
    (select max(salary) from salaries where to_date = '9999-01-01'),
    (select min(salary) from salaries where to_date = '9999-01-01')
)
and to_date = '9999-01-01';