16 What is CHECK Constraint in SQL Server? | Beginner-Friendly Guide
In this video, you will learn about the CHECK constraint in SQL Server and how it helps validate data before insertion or update.
I explain what a CHECK constraint is, how to add it while creating a table, how to add it to an existing table, and common mistakes to avoid.
Complete playlist is here: • SQL Server Basics For Beginners
✅ What you will learn
What is a CHECK constraint in SQL Server
Why CHECK constraint is important
How to use CHECK constraint while creating a table
⚠️ Important Points
CHECK constraint works on insert & update
Allows logical conditions
Cannot reference another table
Difference between CHECK and NOT NULL
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