Employees Earning More Than Their Managers

Desicription

The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.

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+----+-------+--------+-----------+
| Id | Name  | Salary | ManagerId |
+----+-------+--------+-----------+
| 1  | Joe   | 70000  | 3         |
| 2  | Henry | 80000  | 4         |
| 3  | Sam   | 60000  | NULL      |
| 4  | Max   | 90000  | NULL      |
+----+-------+--------+-----------+

Given the Employee table, write a SQL query that finds out employees who earn more than their managers. For the above table, Joe is the only employee who earns more than his manager.

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+----------+
| Employee |
+----------+
| Joe      |
+----------+

Solution

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SELECT E1.Name
AS Employee
from Employee E1, Employee E2
WHERE E1.ManagerId = E2.Id AND E1.Salary > E2.Salary