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Data Analysis for Database Design, 3rd Edition
book

Data Analysis for Database Design, 3rd Edition

by David Howe
May 2001
Intermediate to advanced content levelIntermediate to advanced
336 pages
14h 36m
English
Butterworth-Heinemann
Content preview from Data Analysis for Database Design, 3rd Edition
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Decomposition of
many:many relationships
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A many:many relationship between two entity types can be decomposed into two
1:many relationships. Knowing how to perform this trick is important for two reasons.
Firstly, as shown in Chapter 11, it will make it easy to spot certain unsatisfactory
features which may be present in an entity-relationship type diagram; secondly, some
database management systems are not capable of representing many:many
relationships directly, so all such relationships must be broken down into 1:many
relationships.
It is often assumed that the decomposition can be done as shown in Fig. 10.1, but
such an assumption ...
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Publisher Resources

ISBN: 9780750650861