#1.查詢各job_id的員工工資的最大值，最小值，平均值，總和，并按job_id升序

SELECT MAX(salary), MIN(salary), AVG(salary), SUM(salary), job_id FROM employees GROUP BY job_id ORDER BY job_id;

#2.查詢員工最高工資和最低工資的差距（DIFFERENCE）

SELECT MAX(salary) - MIN(salary) DIFFERENCE FROM employees;

#3.查詢各個管理者手下員工的最低工資，其中最低工資不能低于6000,沒有管理者的員工不計算在內

SELECT MIN(salary), manager_idFROM employeesWHERE manager_id IS NOT NULLGROUP BY manager_idHAVING MIN(salary)>=6000;

#4.查詢所有部門的編號，員工數量和工資平均值，并按平均工資降序

SELECT department_id, COUNT(*), AVG(salary) FROM employees GROUP BY department_id ORDER BY AVG(salary) DESC;

#5.選擇具有各個job_id的員工個數???????

SELECT COUNT(*), job_id FROM employees GROUP BY job_id;

總結

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