[SQL] 리트코드 181. Employees Earning More Than Their Managers

문제

Table: Employee

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| id          | int     |
| name        | varchar |
| salary      | int     |
| managerId   | int     |
+-------------+---------+

id is the primary key (column with unique values) for this table.
Each row of this table indicates the ID of an employee, their name, salary, and the ID of their manager.

 

Write a solution to find the employees who earn more than their managers.
Return the result table in any order.
The result format is in the following example.

 

https://leetcode.com/problems/employees-earning-more-than-their-managers/description/

Employees Earning More Than Their Managers - LeetCode

예시

Example 1:
Input: 
Employee table:

+----+-------+--------+-----------+
| id | name  | salary | managerId |
+----+-------+--------+-----------+
| 1  | Joe   | 70000  | 3         |
| 2  | Henry | 80000  | 4         |
| 3  | Sam   | 60000  | Null      |
| 4  | Max   | 90000  | Null      |
+----+-------+--------+-----------+

Output: 

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

Explanation: Joe is the only employee who earns more than his manager.

문제 풀이

SELECT Employee.name AS Employee
FROM Employee
    INNER JOIN Employee as Manager ON Employee.managerid=Manager.id
WHERE Employee.Salary > Manager.Salary

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SQL을 독학하시는 분들에게 도움이 되길 바라며,

혹 더 좋은 방법이 있거나 오류가 있다면 편하게 말씀 부탁드립니다.