An entity cluster is a "virtual" entity type used to represent multiple entities and relationships in the ERD.
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Q15: The entity supertype contains common characteristics, and
Q16: Within a specialization hierarchy, a supertype can
Q17: Specialization is the top-down process of identifying
Q18: To model time-variant data, one must create
Q19: The completeness constraint can be partial or
Q21: Which of the following is a specialization
Q22: One important inheritance characteristic is that all
Q23: In the context of total completeness, in
Q24: Within a specialization hierarchy, every subtype can
Q25: A specialization hierarchy can have _ level(s)
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