Question: 3 - 2 5 . For a library, the entity type HOLDING has four subtypes: BOOK, AUDIO BOOK, DVD , and SOFTWARE. Draw a separate

3 - 25 .

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:

.

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

.

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 the other subtypes.

.

A holding may or may not be one of these subtypes. On the other hand, a holding may be any two

(

or even four

)

of these subtypes at the same time.

.

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

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