NULL in SQL Explained Simply | Avoid This Common SQL Mistake
Learn NULL in SQL in just 5 minutes with simple, real-world examples.
In this SQL tutorial, you'll understand what NULL really means, why = NULL never works, and how to correctly use IS NULL and IS NOT NULL. You'll also learn how COUNT(), AVG(), and COALESCE() work with NULL values using practical examples.
📚 In This Video:
✔ What is NULL in SQL?
✔ NULL vs 0
✔ NULL vs Empty String ("")
✔ IS NULL vs IS NOT NULL
✔ Why = NULL doesn't work
✔ COUNT(*) vs COUNT(column)
✔ AVG() with NULL values
✔ COALESCE() Explained
✔ Real-world Examples
✔ SQL Interview Tips & Common Mistakes
👨💻 This video is perfect for:
• SQL Beginners
• Data Analysts
• Data Engineers
• Database Developers
• Business Analysts
• Students preparing for SQL Interviews
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