leetcode 185. Department Top Three Salaries

╰+哭是因爲堅強的太久メ 2022-07-19 01:58 7阅读 0赞

### 185. Department Top Three Salaries ###

Question Editorial Solution

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 *  Total Submissions: 49037
 *  Difficulty: Hard

The `Employee` table holds all employees. Every employee has an Id, and there is also a column for the department Id.

+----+-------+--------+--------------+
    | Id | Name  | Salary | DepartmentId |
    +----+-------+--------+--------------+
    | 1  | Joe   | 70000  | 1            |
    | 2  | Henry | 80000  | 2            |
    | 3  | Sam   | 60000  | 2            |
    | 4  | Max   | 90000  | 1            |
    | 5  | Janet | 69000  | 1            |
    | 6  | Randy | 85000  | 1            |
    +----+-------+--------+--------------+

The `Department` table holds all departments of the company.

+----+----------+
    | Id | Name     |
    +----+----------+
    | 1  | IT       |
    | 2  | Sales    |
    +----+----------+

Write a SQL query to find employees who earn the top three salaries in each of the department. For the above tables, your SQL query should return the following rows.

+------------+----------+--------+
    | Department | Employee | Salary |
    +------------+----------+--------+
    | IT         | Max      | 90000  |
    | IT         | Randy    | 85000  |
    | IT         | Joe      | 70000  |
    | Sales      | Henry    | 80000  |
    | Sales      | Sam      | 60000  |
    +------------+----------+--------+

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# Write your MySQL query statement below
    select d.Name as Department, e.Name as Employee, e.Salary as Salary
        from Employee e inner join Department d on e.DepartmentId = d.Id
        where 3>(select count(distinct e1.Salary)
                from Employee e1
                where e1.Salary>e.Salary
                and e1.DepartmentId = e.DepartmentId)

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