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#
查找排除当前最大、最小salary之后的员工的平均工资avg_salary
http://www.nowcoder.com/practice/95078e5e1fba4438b85d9f11240bc591
-- max,min
select avg(salary) as avg_salary
from salaries
where to_date='9999-01-01'
and salary not in
(select max(salary) as max_salary
from salaries
where to_date='9999-01-01'
union all
select min(salary) as min_salary
from salaries
where to_date='9999-01-01')
