Скачать или смотреть SQL Tutorial | Lecture-3 | Constraints, Primary Key & Foreign Key | GATE 2026 | DRDO | ISRO | Bank

Welcome to SQL Tutorial – Lecture 3 🎯

In this video, we will cover important SQL Constraints that help ensure data integrity in your database. Learn the concepts of:
✔️ Primary Key (PK) – Uniquely identifies each row in a table
✔️ Foreign Key (FK) – Links tables and maintains relationships
✔️ Other Constraints – NOT NULL, UNIQUE, CHECK, DEFAULT

📌 What You’ll Learn in this Lecture:
✔️ Definition and importance of Constraints in SQL
✔️ How to define PRIMARY KEY and FOREIGN KEY
✔️ Real-world Example: User Table and Posts Table with proper constraints
✔️ Practical Demonstration:
• Creating tables with constraints
• Inserting valid and invalid data to see constraint enforcement
✔️ Understanding data integrity and relational database rules

🎯 Ideal for:

GATE 2026

DRDO, ISRO

IBPS SO / PO / Clerk

SSC CGL / CHSL

Railway RRB

Bank Exams

College / University Semester Exams

Placement Interview Preparation

👉 Don’t miss:
✔️ Lecture-1: DBMS Intro + SQL History & Commands →    • SQL Tutorial | Lecture-1 | DBMS Introducti...  
✔️ Lecture-2: InstagramDB + Data Types →    • SQL Tutorial  | Lecture-2 | Create Instagr...  

✔️ Upcoming Lectures → SQL Joins, Subqueries, Aggregate Functions, Views, etc.

✅ Subscribe 🔔 for full SQL course with practical examples and exam tricks.

#SQLTutorial #ConstraintsInSQL #PrimaryKey #ForeignKey #GATE2026 #DRDO #ISRO #SSC #IBPS #BankExam #LearnSQL #DatabasePractical