数据库SQL实践54：查找排除当前最大、最小salary以后的员工的平均工资avg_salary

思路：sql 先选出最大工资，再选出最小工资，最终排除最大和最小工资，求平均。（但题目要求排除当前最大工资和当前最小工资，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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