案例1：查詢員工的工資級別

SELECT salary,grade_level FROM employees e JOIN job_grades g ON e.salary BETWEEN g.lowest_sal AND g.highest_sal;

案例2：查詢每個工資級別的個數>20，并按級別排序

SELECT COUNT(*),grade_level FROM employees e JOIN job_grades g ON e.salary BETWEEN g.lowest_sal AND g.highest_sal GROUP BY grade_level HAVING COUNT(*)>20 ORDER BY grade_level DESC;

總結

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