select avg(salary) from salaries where to_date = '9999-01-01' and 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')
select avg(salary) from salaries where to_date = '9999-01-01' and 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')
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