數據庫SQL實踐54：查找排除當前最大、最小salary以後的員工的平均工資avg_salary

思路：sql 先選出最大工資，再選出最小工資，最終排除最大和最小工資，求平均。（但題目要求排除當前最大工資和當前最小工資，彷佛有bug）code select avg(salary) as avg_salary from salaries where to_date = '9999-01-01' and salary not in (select max(salary) from salaries

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