LeetCode 584 | Find Customer Referee| LeetCode TOP 50 SQL Problems | SQL Study Plan

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584. Find Customer Referee
💡 Problem Summary:
You're given a table Customer with customer information including who referred them (via referee_id). The task is to find customers who were not referred by the customer with id = 2.

🗃️ Understanding the Table:
id: Unique customer ID

name: Name of the customer

referee_id: Referring customer’s ID (can be NULL if no one referred them)

🧮 Goal:
Return the names of customers where referee_id is NOT 2.
This includes:

Customers with referee_id != 2

Customers with referee_id IS NULL

✅ Approach (SQL):
Use a simple WHERE clause to filter out those referred by customer id = 2.

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