Consider the E-R diagram in Figure 7.29, which models an online bookstore. a. List the entity sets
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Question:
Consider the E-R diagram in Figure 7.29, which models an online bookstore.
a. List the entity sets and their primary keys.
b. Suppose the bookstore adds Blu-ray discs and downloadable video to its collection. The same item may be present in one or both formats, with differing prices. Extend the E-R diagram to model this addition, ignoring the effect on shopping baskets.
c. Now extend the E-R diagram, using generalization, to model the case where a shopping basket may contain any combination of books, Blu-ray discs, or downloadable video.
Reference Figure 7.29:
Database Design and the E-R Model.
Related Book For
Fundamentals of Database Systems
ISBN: 978-0136086208
6th edition
Authors: Ramez Elmasri, Shamkant Navathe
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