题解 | #汇总各个部门当前员工的title类型的分配数目#
汇总各个部门当前员工的title类型的分配数目
http://www.nowcoder.com/practice/4bcb6a7d3e39423291d2f7bdbbff87f8
select a.dept_no,d.dept_name,a.title,a.count
from departments d
left join
(select de.dept_no,t.title,count(t.emp_no) as count
from dept_emp de
left join titles t
on de.emp_no=t.emp_no
group by de.dept_no,t.title) a
on d.dept_no=a.dept_no
order by d.dept_no,a.title;
不按title排序题目也算我错,不知道为啥就给加上去了