SQL NULL Values Explained | Handle Missing Data the Right Way | TechLight SQL Day 7
✅ Welcome to Day 7 of TechLight’s Practical SQL Series for Beginners!
Today, you’ll learn how to handle missing or unknown data using NULL values in SQL. This is an essential skill for working with real-world databases where incomplete data is common.
💡 In This Lesson, You’ll Learn:
✔️ What NULL means in SQL
✔️ The difference between NULL, 0, and empty values
✔️ How to filter records with missing data using IS NULL and IS NOT NULL
✔️ Beginner mistakes to avoid with NULL comparisons
✔️ Step-by-step demo on Oracle SQL CMD
🚀 By the end of this video, you’ll confidently handle missing data in your SQL projects or interviews!
🎯 Viewer Practice Task:
✔️ Find students with missing Age
✔️ Find students with known Course
✔️ Insert a record with one NULL field
👇 Comment your SQL queries below — I’ll personally review them and guide you!
🎬 Next Lesson: Master SQL Constraints like NOT NULL, UNIQUE, and ensure data integrity
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