테이블
Employee 테이블
| id |
name |
salary |
managerId |
| 1 |
Joe |
70000 |
3 |
| 2 |
Henry |
80000 |
4 |
| 3 |
Sam |
60000 |
|
| 4 |
Max |
90000 |
|
문제
- 자신의 매니저보다 많이 salary를 받는 인원을 뽑으시오
답
SELECT e1.name AS Employee
FROM Employee e1
JOIN Employee e2 ON e1.managerId = e2.id
WHERE e1.salary > e2.salary
;
스키마
Create table If Not Exists Employee (id int, name varchar(255), salary int, managerId int);
Truncate table Employee;
insert into Employee (id, name, salary, managerId) values (1, 'Joe', 70000, 3);
insert into Employee (id, name, salary, managerId) values (2, 'Henry', 80000, 4);
insert into Employee (id, name, salary, managerId) values (3, 'Sam', 60000, NULL);
insert into Employee (id, name, salary, managerId) values (4, 'Max', 90000, NULL);