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    Employees Earning More Than Their Managers

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

    +----+-------+--------+-----------+
    | 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.

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

    Solution : 

    Select e2.Name as Employee 
    FROM Employee e1
    JOIN Employee e2
    ON e1.Id = e2.ManagerId
    AND e1.Salary < e2.Salary;

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