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