Implementing nonoverlapping subtypes requires the use of one discriminator attribute for each subtype.
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Q1: Disjoint subtypes are subtypes that contain nonunique
Q2: One important inheritance characteristic is that all
Q3: The property of a subtype discriminator enables
Q8: The relationships depicted within the specialization hierarchy
Q9: At the implementation level, the supertype and
Q10: A subtype contains attributes that are common
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
Q20: An entity cluster is a "virtual" entity
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