How to Create Relationships & Foreign Keys in SQL Server (GUI and T-SQL) | DBMS Tutorials | Part 18

Welcome to Part 18 of the Database Systems series! Now that we know how to create individual tables, it is time to connect them. In this lecture, we explore the core of relational database design: creating and managing relationships between tables. We will cover both the graphical approach using SSMS and the coding approach using T-SQL to give you a complete understanding of how data is linked and protected. 📌 In this video, you will learn: What Referential Integrity is and why it is critical for database health. How to define a Foreign Key Constraint using the SSMS GUI. How to write the T-SQL query to establish a Foreign Key relationship. Understanding Referential Actions (ON DELETE CASCADE, SET NULL, NO ACTION). How the database engine physically prevents orphaned records and broken links.