Question
For a library, the entity type HOLDING has 4 subtypes: BOOK, AUDIO BOOK, DVD, and SOFTWARE. Draw a separate EER diagram segment for each of
For a library, the entity type HOLDING has 4 subtypes: BOOK, AUDIO BOOK, DVD, and SOFTWARE. Draw a separate EER diagram segment for each of the following situations (put each diagram under the letter/instructions you are diagraming for):
-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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Data Management Databases And Organizations
Authors: Richard T. Watson
6th Edition
1943153035, 978-1943153039
