PostgreSQL IS NULL & IS NOT NULL Explained | NULL Handling in SQL | PostgreSQL Tutorial Episode 9

Pubblicato il: 27 giugno 2026
sul canale di: MJ SIMPLIFIED

Welcome to Episode 9 of our PostgreSQL Database Series!

In this video, you'll learn one of the most important SQL concepts—NULL Handling in PostgreSQL. We'll understand what NULL actually means, why you cannot compare NULL using '=', and how to correctly use IS NULL and IS NOT NULL with practical examples.

If you're a beginner in PostgreSQL or preparing for SQL interviews, this video will help you avoid one of the most common mistakes developers make.

📚 Topics Covered

✅ What is NULL in PostgreSQL?
✅ Difference between NULL, 0, and Empty String
✅ Why = NULL Doesn't Work
✅ Using IS NULL Operator
✅ Using IS NOT NULL Operator
✅ Real-World Examples with Employee Table
✅ Common SQL Mistakes to Avoid
✅ Interview Questions & Answers

🎯 Who Should Watch?

✔ PostgreSQL Beginners
✔ SQL Learners
✔ Software Developers
✔ Database Administrators (DBAs)
✔ Data Analysts
✔ Students Preparing for SQL Interviews
✔ Anyone Learning Database Concepts

📺 PostgreSQL Database Series

▶ Episode 1 – Introduction to PostgreSQL
▶ Episode 2 – SELECT Statement
▶ Episode 3 – ORDER BY Clause
▶ Episode 4 – LIMIT & OFFSET
▶ Episode 5 – DISTINCT, AND & OR Operators
▶ Episode 6 – LIKE & ILIKE Operators
▶ Episode 7 – IN & NOT IN Operators
▶ Episode 8 – BETWEEN & NOT BETWEEN Operators
▶ Episode 9 – NULL Handling (IS NULL & IS NOT NULL)

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