181-employees_earning_more_than_their_managers.sql

-- 181. Employees Earning More Than Their Managers

-- 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      |
-- +----------+


SELECT e.Name AS Employee 
FROM Employee e, Employee m
WHERE e.ManagerId = m.Id AND e.Salary > m.Salary;