SQL Constraints: Stop Duplicate & Bad Data! 🛡️ | NOT NULL to FOREIGN KEY | SQL COURSE

Master SQL Constraints: The Ultimate Guide to Data Integrity! 🛡️ | NOT NULL, PRIMARY KEY, FOREIGN KEY & More

Intro: Welcome back to the SQL Course! In this video, we dive deep into the world of SQL Constraints. If you've ever wondered how databases prevent duplicate entries, wrong ages, or empty fields, the answer is Constraints! Think of them as the "Bouncers" of your database—they ensure only valid data gets inside.

We cover everything from basic theory to a full-scale practical implementation of a School Management System in MySQL Workbench.

What You Will Learn:

🚫 NOT NULL: Make sure critical fields are never left empty.

🆔 PRIMARY KEY & AUTO_INCREMENT: Create unique identities for every row.

💎 UNIQUE: Prevent duplicate emails, usernames, and phone numbers.

🔗 FOREIGN KEY: Master the art of linking tables and creating relationships.

🔄 CASCADE OPTIONS: Understand ON DELETE and ON UPDATE CASCADE like a pro.


⚙️ DEFAULT: Save time by setting automatic values for status or dates.

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