What is a unique identifier of an entity type? Is it possible for there to be more than one unique

QUESTION:

What is a unique identifier of an entity type? Is it possible for there to be more than one unique identifier for an entity type?

SOLUTION:

An attribute, atomic (i.e., simple) or composite, whose values are distinct for each entity in the entity set, is the unique identifier of the entity type. Yes, there can be more than one unique identifier for an entity type.

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