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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
manifestation being explicit, and the other being concealed in customerCode. Likewise,
the table Customer (customerCode, customerName, salesAreaName) also looks fully-
normalised, but the salesAreaCode hidden in customerCode is a determinant of
salesAreaName but not a candidate identifier of Customer. However, many attributes are
potentially composite, and excessive zeal in decomposing them will cause an unnecessary
proliferation of attributes. A price might be decomposed into {poundsPrice, pencePrice} or
a date into {year, month, day}, but in most cases neither decomposition will be useful.
Step 4 Doubtful entity types should be omitted at this stage. ...
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Publisher Resources

ISBN: 9780750650861