What is Foreign Key in SQL? | Database Concepts Explained

Confused about FOREIGN KEY in SQL? It's simpler than you think — and it's one of the most common SQL interview questions.
A Foreign Key connects two tables and ensures your data stays consistent across your entire database.
Practice Foreign Keys with real SQL exercises:
👉 https://www.schoolabe.com/sql-learning
What you'll learn:

What a Foreign Key actually is
Why it's used in database design
Real-life example (Orders → Customers)
How it prevents broken references in your data

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