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
dept_no,
dept_name,
COUNT(emp_no) AS sum
FROM dept_emp
LEFT JOIN departments USING(dept_no)
LEFT JOIN salaries USING(emp_no )
GROUP BY 1,2
ORDER BY 1
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