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Complete playlist is here: https://www.youtube.com/playlist?list=PLKFKd7UiwVxMiV9Cy7gaF8A_ylx4FuFA9 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 ...
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