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Heff Heff
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6 years ago
Which of the following is true about identifiers of entities?
A) Identifiers must be unique.
B) Identifiers are not normally used in a naming role.
C) The value of an identifier may identify a set of entity instances.
D) Identifiers may not be more than two attributes.
E) An identifier in the E-R model is equivalent to a key in the relational model.
Textbook 
Database Concepts

Database Concepts


Edition: 7th
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ade9jaade9ja
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