SQL NOT NULL, PRIMARY KEY & FOREIGN KEY Explained | Constraints Step by Step

In this video, you will learn SQL Constraints in a simple and beginner-friendly way. Constraints are rules applied to table columns to maintain data accuracy, consistency, and integrity in a database.

We will cover the most important constraints:

NOT NULL – Prevents empty values

UNIQUE – Ensures all values are different

PRIMARY KEY – Uniquely identifies each record

FOREIGN KEY – Creates relationships between tables

CHECK – Applies conditions to column values

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