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

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

c. A holding may or may not be one of these subtypes. Also, a holding may be any two or three of these subtypes at the same time.

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