The entity supertype contains the common characteristics and the entity subtypes contain the unique characteristics of each entity subtype.
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Q1: Implementing nonoverlapping subtypes requires the use of
Q7: To model time-variant data,you must create a
Q8: The relationships depicted within the specialization hierarchy
Q9: At the implementation level, the supertype and
Q9: The property of subtype discriminator enables an
Q12: A design trap occurs when a relationship
Q14: Overlapping subtypes are subtypes that contain a
Q19: The completeness constraint can be partial or
Q20: An entity cluster is a "virtual" entity
Q24: Some designs use redundant relationships as a
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