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select d.DEPARTMENT, cast(min(E.salary) as float) / nullif(cast(max(E.salary) as float), 0) as SALARY_DIFF_RATIO from employee as E join DEPARTMENT as d on E.dept_no = d.dept_no group by d.DEPARTMENT order by SALARY_DIFF_RATIO desc ; SELECT 'Last_query_cost' AS "Variable_name", 0 AS "Value" FROM RDB$DATABASE;

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