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
https://www.nowcoder.com/practice/4bcb6a7d3e39423291d2f7bdbbff87f8
select d.dept_no, d.dept_name, t.title, count(t.emp_no) as count from departments d left join dept_emp d1 on d.dept_no = d1.dept_no left join titles t on d1.emp_no = t.emp_no group by d.dept_no, d.dept_name, t.title order by d.dept_no