Free Online Firebird 4.0 (Employee) Playground: Practice & Master SQL Skills

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SELECT d.DEPARTMENT, CAST(MIN(e.SALARY) AS DOUBLE PRECISION) / NULLIF(CAST(MAX(e.SALARY) AS DOUBLE PRECISION), 0) AS SALARY_DIFF_RATIO FROM DEPARTMENT d JOIN EMPLOYEE e ON d.DEPT_NO = e.DEPT_NO WHERE e.SALARY IS NOT NULL AND e.SALARY <> 0 GROUP BY d.DEPARTMENT ORDER BY SALARY_DIFF_RATIO DESC, d.DEPARTMENT;

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