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What is UNIQUE Key in SQL Server? | Unique Constraint Explained
In this video, you will learn what a UNIQUE key (UNIQUE constraint) is in SQL Server and how it helps prevent duplicate values in a table. This beginner-friendly tutorial explains how UNIQUE constraints work, how they differ from PRIMARY KEY, and how to use them correctly in real-world databases. 👉 What you will learn What is a UNIQUE key in ...
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