Primary Key vs Foreign Key in SQL — What Actually Connects Tables?
🎓 Primary Key vs Foreign Key in SQL — Explained with Real Examples!
Welcome to Datomix Academy! In this video, we break down two of the most essential concepts in SQL: Primary Keys and Foreign Keys — the foundation of every relational database.
👉 You’ll learn:
• What a primary key is (and why it’s critical)
• How foreign keys create relationships between tables
• Real-life examples using students and enrollments tables
• How JOINs actually use these keys to combine data
• A simple analogy to help everything click
✅ Whether you’re just starting with SQL or brushing up your basics, this tutorial will help you truly understand how tables connect and why keys matter. #sql #dataengineering #datomixacademy #sqltutorial #postgresql #learnsql #bootcamp #learntocode #cte #etl