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 de.dept_no, d.dept_name, t.title, count(*) as count from departments d, dept_emp de, titles t where de.dept_no = d.dept_no and de.emp_no = t.emp_no group by d.dept_name, t.title order by de.dept_no, t.title;