(SQL) Foreign Key in CREATE Table | Order Matters, Circular Dependency & NOT NULL Trap
In this video, we explore one of the most important concept in SQL — Foreign Key Constraints during table creation.
You will learn:
• Referenced table must exist before adding a foreign key
• What happens when table creation order is incorrect
• Circular referencing problem explained clearly
• The tricky case of circular dependency with NOT NULL constraints
• Practical workaround using ALTER TABLE
This topic is extremely important for:
GATE (CSE & DA), DBMS interviews, and real-world database design.
💡 Key Takeaway:
A table must exist before it can be referenced by a foreign key in a CREATE statement.
🔥 Perfect for:
GATE Aspirants
Computer Science Students
Data Analysts / Backend Developers
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