题解 | #平均工资#
平均工资
http://www.nowcoder.com/practice/95078e5e1fba4438b85d9f11240bc591
select avg(salary) avg_salary
from salaries
where salary <> (select max(salary) from salaries where to_date = '9999-01-01')
and salary <> (select min(salary) from salaries where to_date = '9999-01-01')
and to_date = '9999-01-01'
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