The Employee table holds all employees. Every employee has an Id, and there is also a column for the department Id.
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+----+-------+--------+--------------+ | 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.
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+----+----------+ | 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.
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+------------+----------+--------+ | Department | Employee | Salary | +------------+----------+--------+ | IT | Max | 90000 | | IT | Randy | 85000 | | IT | Joe | 70000 | | Sales | Henry | 80000 | | Sales | Sam | 60000 | +------------+----------+--------+
SELECT d.Name AS Department, e.Name AS Employee, e.Salary AS Salary FROM Employee AS e, Department AS d WHERE e.DepartmentId=d.Id AND 3 > ( SELECT COUNT(DISTINCT tmp.Salary) FROM Employee AS tmp WHERE tmp.Salary > e.Salary AND tmp.DepartmentId=e.DepartmentId )