Department Top Three Salaries

A company's executives are interested in seeing who earns the most money in each of the company's departments. 
A high earner in a department is an employee who has a salary in the top three unique salaries for that department.
Write an SQL query to find the employees who are high earners in each of the departments.
Return the result table in any order.
The query result format is in the following example.
 
Employee table:
+----+-------+--------+--------------+
| Id | Name  | Salary | DepartmentId |
+----+-------+--------+--------------+
| 1  | Joe   | 85000  | 1            |
| 2  | Henry | 80000  | 2            |
| 3  | Sam   | 60000  | 2            |
| 4  | Max   | 90000  | 1            |
| 5  | Janet | 69000  | 1            |
| 6  | Randy | 85000  | 1            |
| 7  | Will  | 70000  | 1            |
+----+-------+--------+--------------+

Department table:
+----+-------+
| Id | Name  |
+----+-------+
| 1  | IT    |
| 2  | Sales |
+----+-------+

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

In the IT department:
- Max earns the highest unique salary
- Both Randy and Joe earn the second-highest unique salary
- Will earns the third-highest unique salary

In the Sales department:
- Henry earns the highest salary
- Sam earns the second-highest salary
- There is no third-highest salary as there are only two employees



Answer:

SELECT T.DEPARTMENT,
       T.EMPLOYEE,
       T.SALARY
FROM (
    SELECT D.NAME AS DEPARTMENT,
           E.NAME AS EMPLOYEE,
           E.SALARY,
           DENSE_RANK() OVER(PARTITION BY D.NAME ORDER BY E.SALARY DESC) AS RNK
    FROM DEPARTMENT D
    JOIN EMPLOYEE E ON D.ID = E.DEPARTMENTID
) T
WHERE T.RNK <= 3
;