Complete PostgreSQL Course for Beginners - POWERFUL SQL Interview Question Based on NOT EXISTS vs NOT IN

I remember the first time I faced an SQL interview question about NOT EXISTS vs NOT IN — I froze. It sounded like such a small detail, but the more I dug into it, the more I realized how crucial it was. Why do so many experienced developers prefer NOT EXISTS over NOT IN? It’s not just about performance — it’s about avoiding subtle, hard-to-catch bugs that can cost you hours of debugging. 🎯 Level up with my book 'Mastering SQL Windows Functions'—get your copy today! 📘💡https://dataprofy.com/product/mastering-sql-windows-functions/ ============ Watch how to configure Oracle on VS Code https://youtu.be/6mwAx4sGhwk Explore the complete PL/SQL course for FREE on my website at https://www.rebellionrider.com/category/pl-sql/ ============ The camera gear I use in my Videos https://www.amazon.in/shop/manishsharma?listId=DU9UM0XL97KM&ref=idea_share_inf ============ Connect With Me on My Social Media https://www.instagram.com/RebellionRider/ https://www.facebook.com/TheRebellionRider/ https://twitter.com/RebellionRider https://www.linkedin.com/in/mannbhardwaj/ ============ FAQ Which book to refer to learn - PL/SQL https://amzn.to/2QE1jX0 Performance Tuning https://amzn.to/2sgiAw4 1z0-071 Exam https://amzn.to/2sgfeJw Python Programming https://amzn.to/305UEbh ============ AFFILIATE DISCLOSURE: Some of the links used in the description will direct you to Amazon.in. As an Amazon Associate, I earn from qualifying purchases at no additional cost to you. #rebellionrider ============= In this video, we'll explore a common pitfall when using the NOT IN operator in SQL - its behavior with NULL values. You might expect the NOT IN operator to return all rows where the value is not present in the list, but what happens when NULL is part of that list? We'll demonstrate why the NOT IN operator fails with NULL values and discuss the implications for your database queries. Learn how to avoid this common mistake and write more effective SQL queries.