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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) If participation is obligatory for only one entity type, define two table types, one
for each entity. Post the identifier of the non-obligatory entity into the obligatory
entity’s table type.
(c) If participation is non-obligatory for both entity types, define three table types,
one for each entity and one for the relationship.
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Consider the assignment of patients to hospital wards. The relationship Contains
between entity types ward and Patient is 1:many (if current assignments only are
considered) since a ward may contain many patients but a patient cannot be assigned to
more than one ward. The identifiers ...
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Publisher Resources

ISBN: 9780750650861