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
https://www.nowcoder.com/practice/4bcb6a7d3e39423291d2f7bdbbff87f8
SELECT
de.dept_no,
dp.dept_name,
t.title,
count(*) count
FROM dept_emp de
LEFT JOIN departments dp
ON de.dept_no = dp.dept_no
LEFT JOIN titles t
ON de.emp_no = t.emp_no AND de.to_date = t.to_date
GROUP BY de.dept_no,t.title
ORDER BY de.dept_no,t.title
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