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Differences Between Primary Key and Unique Constraint

If you are reading this article, you should read my articles “What is Primary Key And Foreign Key” and “What is Unique Constraint” at first.

After reading these articles, let’s examine the differences between primary key and unique constraint;

Difference Between Primary Key and Unique Constraint

Primary Key

Unique Constraint

Violation of Unique Key Constraint ‘x’. Cannot insert duplicate key in object ‘x’.

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