Algorithm
Problem Name: 584. Find Customer Referee
Problem Link: https://leetcode.com/problems/find-customer-referee/
SQL Schema
Table: Customer
+-------------+---------+ | Column Name | Type | +-------------+---------+ | id | int | | name | varchar | | referee_id | int | +-------------+---------+ id is the primary key column for this table. Each row of this table indicates the id of a customer, their name, and the id of the customer who referred them.
Write an SQL query to report the names of the customer that are not referred by the customer with id = 2.
Return the result table in any order.
The query result format is in the following example.
Example 1:
Input: Customer table: +----+------+------------+ | id | name | referee_id | +----+------+------------+ | 1 | Will | null | | 2 | Jane | null | | 3 | Alex | 2 | | 4 | Bill | null | | 5 | Zack | 1 | | 6 | Mark | 2 | +----+------+------------+ Output: +------+ | name | +------+ | Will | | Jane | | Bill | | Zack | +------+
Code Examples
#1 Code Example with SQL
Code -
SQL
# Write your MySQL query statement below
select name
from customer
where referee_id <> 2 or referee_id is NULL;
Input
Customer table:
+----+------+------------+
| id | name | referee_id |
+----+------+------------+
| 1 | Will | null |
| 2 | Jane | null |
| 3 | Alex | 2 |
| 4 | Bill | null |
| 5 | Zack | 1 |
| 6 | Mark | 2 |
+----+------+------------+
Output
+------+
| name |
+------+
| Will |
| Jane |
| Bill |
| Zack |
+------+