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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
(b) Fig. 11.2a to connect Department and Employee directly;
(c) the type diagram in question 1 above, to connect Division and Department
directly. (5 min)
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Our final example is of a situation which cannot be resolved merely by adding an
additional relationship type. Suppose any supplier can supply any part to any customer.
An attempt at an entity-relationship diagram is shown in Fig. 11.4a. By decomposing
the many:many relationships into 1:many relationships (Fig. 11.4b) it can be seen that
the diagram conceals a many:1/1:many structure, and should therefore be regarded
with particular caution. A fairly obvious connection trap in ...
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Publisher Resources

ISBN: 9780750650861