mysql 求各部门的平均工资最大值和最小值

好的，我可以回答这个问题。以下是MySQL查询语句：

求各部门平均工资的最大值：

SELECT MAX(avg_salary) FROM (SELECT AVG(salary) AS avg_salary FROM employees GROUP BY department_id) AS avg_salaries;

求各部门平均工资的最小值：

SELECT MIN(avg_salary) FROM (SELECT AVG(salary) AS avg_salary FROM employees GROUP BY department_id) AS avg_salaries;

请注意，这只是一个演示，实际上需要根据你的具体数据表和字段进行调整。