This Leetcode problem Find Customer Referee LeetCode Solution is done in SQL.

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Find Customer Referee LeetCode Solution

Problem Statement

In SQL, 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.

Find the names of the customer that are not referred by the customer with id = 2.

Return the result table in any order.

The result format is in the following example.

Example 1:
Input:

Output:

Find Customer Referee LeetCode Solution MySQL

select 
  name 
from 
  customer 
where 
  referee_id is null 
  or referee_id <> 2;Code language: SQL (Structured Query Language) (sql)