Entities with an IS-A relationship should have the same identifier.
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Q42: Subtype entities contain,apart from the identifier,only attributes
Q43: Recursive relationships only exist for one-to-one relationships.
Q44: Data modelers agree that weak,non-ID-dependent entities exist
Q45: The supremetype entity contains the attributes that
Q47: Which of the following is not a
Q48: Which of the following is not a
Q49: Relationships between supertypes and subtypes are called
Q50: ID-dependent entities are a common type of
Q51: Relationships among instances of a single entity
Q52: An attribute that determines which subtype is
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