What is a Primary Key in DBMS? | Database Constraints Explained.

Описание: Welcome back to Code with Ash! 💻 Today, we are cracking one of the most important concepts in DBMS: The Primary Key.

Imagine a classroom without Roll Numbers—it would be chaos, right? That’s exactly what happens to a database without a Primary Key. In this video, I explain exactly what a Primary Key is, why it is mandatory for a good database design, and how it is different from a Unique Key.

📝 What we cover in this video:

What is a Primary Key? (Definition & Real-world Example).

The 2 Golden Rules: Unique & Not Null.

How to set a Primary Key in SQL (Syntax).

Primary Key vs. Unique Key: The #1 Interview Question!

Simple vs. Composite Primary Keys.

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