题解 | 平均工资
平均工资
https://www.nowcoder.com/practice/95078e5e1fba4438b85d9f11240bc591
select avg(salary) as avg_salary from (select *,salary-max(salary) over() as m1,salary-min(salary) over() as m2 from salaries where to_date='9999-01-01') as p1 where not (m1=0 or m2=0);
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