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Database Modeling with Microsoft® Visio for Enterprise Architects
book

Database Modeling with Microsoft® Visio for Enterprise Architects

by Terry Halpin, Ken Evans, Pat Hallock, Bill Maclean
September 2003
Intermediate to advanced content levelIntermediate to advanced
425 pages
16h 30m
English
Morgan Kaufmann
Content preview from Database Modeling with Microsoft® Visio for Enterprise Architects
Qualification 3 (restricting the foreign key reference to female patients) can be
implemented by using the Database Properties dialog to add appropriate triggers to the
Patient and PapSmear tables.
Mapping Subtypes to Separate Tables
To summarize our earlier discussion, the ORM schema in Figure 7–31 maps to the log-
ical schema shown in Figure 7–34, if we use the default mapping procedure, where sub-
types roles that are functional (with a simple uniqueness constraint) are effectively
absorbed back to the supertype before mapping. The prostate and pregnancy fact types
are functionally dependent on their subtype, so are absorbed into the supertype table ...
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Publisher Resources

ISBN: 9781558609198