题解 | #统计各个部门的工资记录数#
统计各个部门的工资记录数
https://www.nowcoder.com/practice/6a62b6c0a7324350a6d9959fa7c21db3
SELECT
de.dept_no,
d.dept_name,
COUNT(s.salary) AS sum
FROM
departments d
JOIN dept_emp de ON d.dept_no = de.dept_no
JOIN salaries s ON de.emp_no = s.emp_no
GROUP BY de.dept_no
ORDER BY
dept_no ASC;
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