SELECT
AVG( salary
) AS avg_salary
FROM
salaries
WHERE
to_date
= '9999-01-01'
AND salary
NOT IN ( SELECT MAX( salary
) FROM salaries
WHERE to_date
= '9999-01-01' )
AND salary
NOT IN (
SELECT
MIN( salary
)
FROM
salaries
WHERE
to_date
= '9999-01-01')
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