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Beginning Database Design: From Novice to Professional, Second Edition by Clare Churcher

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CHAPTER 4

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Learning from the Data Model

In the previous chapter, we attempted to extract the essential tasks involved in a real-world problem and express them with use cases. We also made a first attempt at determining the data that are necessary to support those tasks and formed an initial data model, which we depicted with a class diagram. In this chapter, we look more closely at the data model to see how it can further our understanding of a database system.

A data model is a precise description of the data stored for a real–world problem, in much the same way that a mathematical equation describes a real-world physical event, or an architectural ...

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