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

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SELECT department_name AS DEPARTMENT, CAST(MIN(salary) AS DECIMAL(10, 2)) / CAST(MAX(salary) AS DECIMAL(10, 2)) AS SALARY_DIFF_RATIO FROM employees GROUP BY department_name HAVING MAX(salary) > 0 -- To avoid division by zero ORDER BY SALARY_DIFF_RATIO DESC, department_name ASC; ; SELECT 'Last_query_cost' AS "Variable_name", 0 AS "Value" FROM RDB$DATABASE;

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