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
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';
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