When an entity instance may be a member of multiple subtypes or it does not have

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When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?



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2) Which one of the following symbols is not used in an ERD?

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

4) A subtype discriminator is which of the following?

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

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