Getting Started with Data Modeling
A data model is a representation of the information consumed and produced by a system, which lets you analyze the data objects present in the system and the relationships between them. PowerDesigner provides conceptual, logical, and physical data models to allow you to analyze and model your system at all levels of abstraction.
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Graeme Simsion, Van Nostrand Reinhold, Data Modeling Essentials, 1994, 310 pages; paperbound; ISBN 1850328773
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James Martin, Prentice Hall, Information Engineering, 1990, three volumes of 178, 497, and 625 pages respectively; clothbound, ISBN 0-13-464462-X (vol. 1), 0-13-464885-4 (vol. 2), and 0-13-465501-X (vol. 3).
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Joe Celko, Joe Celko's SQL for Smarties (Morgan Kaufmann Publishers, Inc., 1995), 467 pages; paperbound; ISBN 1-55860-323-9.