题解 | 获取每个部门中薪水最高的员工相关信息

WITH t1 AS (
    SELECT
        de.dept_no,
        max(s.salary) maxSalary
    FROM dept_emp de
    JOIN salaries s ON de.emp_no = s.emp_no
    GROUP BY de.dept_no
    )

SELECT
    de.dept_no,
    de.emp_no,
    salary
FROM dept_emp de
JOIN salaries s ON de.emp_no = s.emp_no
JOIN t1 ON de.dept_no = t1.dept_no AND s.salary = t1.maxSalary
ORDER BY de.dept_no