180608_group_compare

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 e1.Name AS Employee
FROM Employee e1, Employee e2
WHERE e1.I

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