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
哭了，超过2%的人，我的代码真的那么不堪吗？
SELECT de.dept_no, d.dept_name, t.title, COUNT(t.title) AS count
from titles as t
LEFT JOIN dept_emp as de
ON t.emp_no = de.emp_no
LEFT JOIN departments as d
ON de.dept_no = d.dept_no
WHERE t.to_date = '9999-01-01'
and de.to_date = '9999-01-01'
GROUP BY dept_name,title
ORDER BY de.dept_no, t.title
;