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 B.dept_no,B.dept_name,C.title,COUNT(*) AS 'COUNT'
FROM dept_emp A LEFT JOIN departments B
ON A.dept_no = B.dept_no AND A.to_date = '9999-01-01'
JOIN titles C
ON A.emp_no = C.emp_no AND A.to_date = '9999-01-01'
GROUP BY dept_no,title
ORDER BY dept_no
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