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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
This Page Intentionally Left Blank
ORM Notation
Entity type A
Value type B
A identified by
reference mode
Ref
Independent
entity type A
External
object type A
A
B
A !
A
A
C
B
U
A
(Ref)
smokes
Unary predicate
(1 role)
Binary predicate (2 roles)
Forward reading shown.
Binary predicate
Two readings shown.
Ternary predicate
(3 roles)
Quaternary predicate
(4 roles)
etc.
Each role is played
only by the object type
to which it is attached
works for
works for / employs
... began ... on ...
... played ... for ... in ...
Unary predicate
or
UC on role pair 1-2
"P" may be used for
primary uniqueness, for example:
External Uniqueness Constraint:
UC on role pair 1, 3 Combined UCs
Many other UC
combinations ...
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Publisher Resources

ISBN: 9781558609198