LeetCode SQL 584: Find Customer Referee | Step-by-Step Easy Solution Explained

Welcome to our SQL tutorial series! 🎉

In this video, we’ll tackle LeetCode Problem 584: Find Customer Referee, a beginner-friendly SQL challenge that strengthens your skills in filtering data using logical conditions like OR and IS NULL. and Using COALESCE() Function.

🖥️ What You'll Learn:

How to filter rows in SQL based on multiple conditions.
Real-world applications of working with NULL values in SQL.
Step-by-step explanation of the SQL query to solve this problem.
📋 Problem Overview:
You’ll learn how to query customer data to exclude those referred by a specific customer (id = 2) while including others with no referee (referee_id IS NULL). This solution is simple yet powerful for data filtering!

🔗 Related Links:

Try this problem on LeetCode: LeetCode 584 - Find Customer Referee
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