select avg(salary) as avg_salary from salaries
where to_date = '9999-01-01' and
salary not in (select min(salary) from salaries where to_date = '9999-01-01') and
salary not in (select max(salary) from salaries where to_date = '9999-01-01')
select avg(salary) as avg_salary from salaries
where to_date = '9999-01-01' and
salary not in (select min(salary) from salaries where to_date = '9999-01-01') and
salary not in (select max(salary) from salaries where to_date = '9999-01-01')
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