CHAPTER 4
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 ...
Get Beginning Database Design: From Novice to Professional, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
