题解 | #查找最晚入职员工的所有信息#
统计各个部门的工资记录数
http://www.nowcoder.com/practice/6a62b6c0a7324350a6d9959fa7c21db3
select departments.*,count(salaries.salary)as sum from departments
right join dept_emp on departments.dept_no=dept_emp.dept_no
left join salaries on dept_emp.emp_no=salaries.emp_no
group by 1,2
order by departments.dept_no
right join dept_emp on departments.dept_no=dept_emp.dept_no
left join salaries on dept_emp.emp_no=salaries.emp_no
group by 1,2
order by departments.dept_no
投递明基等公司6个岗位 >