An entity supertype can have disjoint or overlapping entity subtypes.
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Q2: One important inheritance characteristic is that all
Q3: The property of a subtype discriminator enables
Q4: In specialization hierarchies with multiple levels of
Q5: Implementing overlapping subtypes requires the use of
Q6: Entity subtypes do not inherit the relationships
Q8: The relationships depicted within the specialization hierarchy
Q9: At the implementation level, the supertype and
Q10: A subtype contains attributes that are common
Q11: The function of the primary key is
Q12: A design trap occurs when a relationship
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