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leetcode/problem/department-top-three-salaries.html

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+<p>Table: <code>Employee</code></p>
+
+<pre>
++--------------+---------+
+| Column Name  | Type    |
++--------------+---------+
+| id           | int     |
+| name         | varchar |
+| salary       | int     |
+| departmentId | int     |
++--------------+---------+
+id is the primary key column for this table.
+departmentId is a foreign key of the ID from the <code>Department </code>table.
+Each row of this table indicates the ID, name, and salary of an employee. It also contains the ID of their department.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Table: <code>Department</code></p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| id          | int     |
+| name        | varchar |
++-------------+---------+
+id is the primary key column for this table.
+Each row of this table indicates the ID of a department and its name.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>A company&#39;s executives are interested in seeing who earns the most money in each of the company&#39;s departments. A <strong>high earner</strong> in a department is an employee who has a salary in the <strong>top three unique</strong> salaries for that department.</p>
+
+<p>Write an SQL query to find the employees who are <strong>high earners</strong> in each of the departments.</p>
+
+<p>Return the result table <strong>in any order</strong>.</p>
+
+<p>The query result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+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 |
++----+-------+
+<strong>Output:</strong> 
++------------+----------+--------+
+| Department | Employee | Salary |
++------------+----------+--------+
+| IT         | Max      | 90000  |
+| IT         | Joe      | 85000  |
+| IT         | Randy    | 85000  |
+| IT         | Will     | 70000  |
+| Sales      | Henry    | 80000  |
+| Sales      | Sam      | 60000  |
++------------+----------+--------+
+<strong>Explanation:</strong> 
+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
+</pre>