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
d.dept_no,
d.dept_name,
t.title,
COUNT( t.title ) AS count
FROM
dept_emp de
LEFT JOIN titles t ON t.emp_no = de.emp_no
LEFT JOIN departments d ON d.dept_no = de.dept_no
GROUP BY
d.dept_no,
t.title
ORDER BY
d.dept_no,
t.title;
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