# 第一步 查询每个部门的最低工资按部门分组 SELECT AVG(salary) avg_sal FROM employees GROUP BY department_id; # 第二步 查询最低平均工资 SELECT MIN(avg_sal) FROM (SELECT AVG(salary) avg_sal FROM employees GROUP BY department_id) dept_avg_sal; # 1、第三步 查询平均工资最低的部门id SELEC...