题解 | #平均工资#
平均工资
https://www.nowcoder.com/practice/95078e5e1fba4438b85d9f11240bc591
select avg(salary) from salaries
where to_date='9999-01-01' and salary not in (
select max(salary) from salaries where to_date='9999-01-01'
union
select min(salary) from salaries where to_date='9999-01-01'
)
