22 How to create a Composite Unique Key in SQL Server? | Step-by-Step Tutorial
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Enforce uniqueness across multiple columns in a table.
This is a very common real-world database requirement, especially when a single column is not enough to uniquely identify records.
✅ What you’ll learn in this video
What is a Composite Unique Key in SQL Server
Difference between UNIQUE key vs Composite UNIQUE key
Why and when composite unique keys are used
How to create a composite UNIQUE constraint
How SQL Server handles duplicate data
Real-world example with multiple columns
Composite UNIQUE key checks combined column values
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