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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
many:many relationship may, in general, include 1:many (in either direction), 1:1, 1:0
and 0:1 relationships, although some, or all, of these possibilities could be excluded
from a many:many relationship by more restrictive enterprise rules.
Notation
Figure 9.2 shows how the degree of a relationship is represented on an entity-
relationship type diagram. Answers to questions which ask for an entity-relationship
type diagram should always show the degree of each relationship if the information is
available.
Fig. 9.2 Representation of relationship degree on an entity-relationship type diagram
(a) Representation of 1:1 relationship
(b) Representation of ...
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Publisher Resources

ISBN: 9780750650861