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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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