Within a specialization hierarchy, a supertype can exist only within the context of a subtype.
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Q11: The function of the primary key is
Q12: A design trap occurs when a relationship
Q13: Entity supertypes and subtypes are organized in
Q14: Overlapping subtypes are subtypes that contain a
Q15: The entity supertype contains common characteristics, and
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
Q20: An entity cluster is a "virtual" entity
Q21: Which of the following is a specialization
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