An identifier is a candidate key that has been selected to be used as the unique characteristic for an entity type.

Name: An identifier is a candidate key that has been selected to be used as the unique characteristic for an entity type.
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Quizplus · Accepted Answer

An identifier is a candidate key that is chosen to uniquely identify instances of an entity type. It is used to differentiate between different instances of the same entity type. Therefore, an identifier is a unique characteristic for an entity type.

An Identifier Is a Candidate Key That Has Been Selected