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
三表连接， 然后按部门号，部门名， title类型分组， 最后按部门号排序
select d.dept_no, d.dept_name, t.title, count(t.title)
from departments d
join dept_emp e
on d.dept_no=e.dept_no
join titles t
on e.emp_no = t.emp_no
where e.to_date = '9999-01-01' and t.to_date='9999-01-01'
group by d.dept_no, d.dept_name, t.title
order by d.dept_no;
from departments d
join dept_emp e
on d.dept_no=e.dept_no
join titles t
on e.emp_no = t.emp_no
where e.to_date = '9999-01-01' and t.to_date='9999-01-01'
group by d.dept_no, d.dept_name, t.title
order by d.dept_no;
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