Question

What is a primary key in the context of the ER model?

A A key attribute that uniquely identifies an entity Correct Answer Incorrect Answer
B A key attribute that is used for data encryption Correct Answer Incorrect Answer
C A key attribute that is derived from other attributes Correct Answer Incorrect Answer
D A key attribute that is optional in the database Correct Answer Incorrect Answer

Solution

A key attribute that uniquely identifies an entity    

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