LEETCODE 584 - Find Customer Referee - Solution in MySQL | LEETCODE 584 Database SQL Solution

LEETCODE 584 - Find Customer Referee - Solution in MySQL | LEETCODE 584 Database SQL Solution 

                                                                                            LEETCODE | 584

Find Customer Referee


LEETCODE 584 - Find Customer Referee - Solution in MySQL | LEETCODE 584 Database SQL Solution:

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 |
+------+

Solution of LEETCODE 584 - Find Customer Referee:

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