SQL Episode 6 Null Values

In this video, we provide a complete introduction to NULL Values in SQL and explain what NULL means in a database. You will learn how NULL represents missing or unknown data and why it is different from values like zero or an empty string. The video also demonstrates how to identify and filter NULL values when writing SQL queries. This lesson is designed for beginners in SQL, QA, and data analysis who want to understand how databases handle missing information and how to work with NULL values correctly. Topics covered in this video: What NULL means in SQL The difference between NULL, zero, and empty values Using IS NULL in SQL queries Using IS NOT NULL to filter data Handling NULL values in database queries Common mistakes when working with NULL By the end of this video, you will have a clear understanding of how NULL values work in SQL and how to manage them when querying a database. This video is part of a beginner-friendly SQL and QA series focused on practical knowledge and real-world database skills. Subscribe for more SQL lessons, QA tutorials, and automation testing guides. 🚀