How to Handle NULL Values in SQL | IS NULL, IS NOT NULL, COALESCE | Interview Questions + Examples
Welcome to Lecture 8 of the SQL Interview Preparation Series by Engineer’s Coding Hub!
In this video, we take a deep dive into one of the most commonly misunderstood topics in SQL —
👉 Handling NULL Values in SQL with practical real-life examples.
📌 Whether you're preparing for interviews, solving SQL assessments, or working with real databases — understanding NULL handling is a must!
🎯 In this 7-minute video, you will learn:
✅ What is NULL in SQL and why it matters
✅ How to use IS NULL, IS NOT NULL
✅ Difference between NULL and empty string
✅ Frequently asked SQL interview questions involving NULL
✅ Real-time examples & practical query explanations
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💼 Ideal For:
Students preparing for tech placements
Backend developers
SQL beginners
Anyone solving interview or DSA-style query rounds
Chapters (Timestamps)
00:00 - Introduction
00:45 - What is NULL in SQL?
02:10 - IS NULL vs IS NOT NULL
5:20 - Real Interview Questions
Key Points Covered:
What are NULL values and what do they represent?
Why regular comparison operators (= and !=) don't work with NULL.
How to check for NULL values using IS NULL.
How to find non-NULL values using IS NOT NULL.
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