[LeetCode] 181. Employees Earning More Than Their Managers

Problem

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 e.Name as "Employee" from Employee e 
join Employee m 
on (e.ManagerId = m.Id) 
where e.Salary > m.Salary;