leetcode数据库sql之Department Top Three Salaries

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SELECT  d.name as department, e.name,e.salary
FROM Employee e JOIN Department d ON e.departmentid = d.id
and
    (SELECT   COUNT(DISTINCT (salary))
     FROM
            Employee
     WHERE
            departmentid = e.departmentid
     AND    salary > e.salary
     ) < 3
ORDER BY d.id ASC , e.salary DESC