181. Employees Earning More Than Their Managers.sql

/*
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 one is not using join, two is using join
*/# Write your MySQL query statement below
SELECT
    a.Name As Employee
FROM
    Employee AS a,
    Employee AS b
WHERE
    a.ManagerId = b.ID
AND
    a.Salary > b.Salary
;



SELECT
    a.Name As Employee
FROM
    Employee AS a
JOIN
    Employee AS b
ON
    a.ManagerId = b.ID
AND
    a.Salary > b.Salary