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

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SELECT d.department, TRIM(CAST(CAST(MIN(e.salary) * 1.0 / MAX(e.salary) AS NUMERIC(10,6)) AS VARCHAR(20))) AS salary_diff_ratio FROM employee AS e JOIN department AS d USING (dept_no) GROUP BY d.department ORDER BY salary_diff_ratio DESC, d.department; ; SELECT 'Last_query_cost' AS "Variable_name", 0 AS "Value" FROM RDB$DATABASE;

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