(Answered) For a library the entity type holding has four subtypes

Management Studies

For a library, the entity type HOLDING has four subtypes: BOOK, AUDIO BOOK, DVD, and SOFTWARE. Draw a separate EER diagram segment for each of the following situations.

a. At a given time, a holding must be exactly one of these subtypes.

b. A holding may or may not be one of these subtypes. However, a holding that is one of these subtypes cannot at the same time be one of these subtypes.

c. A holding may or may not be one of these subtypes. On the other hand, s holding may be any two (or even four) of these subtypes at the same time.

d. At a given time, a holding must be at least one of these subtypes.

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