Use of a supertype/subtype relationship is necessary when which of the following

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Use of a supertype/subtype relationship is necessary when which of the following exists?



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2) When an entity instance must be a member of only one subtype, it is which of the following?

3) An oval represents which of the following in an EER?

4) A subtype discriminator is which of the following?

5) A supertype/subtype hierarchy is which of the following?

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