Algorithms And Data Structures

Get Algorithms in SNOBOL4 PDF

By James F. Gimpel

ISBN-10: 0471302139

ISBN-13: 9780471302131

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Extra resources for Algorithms in SNOBOL4

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Road” and “Street” have not been abbreviated consistently in the Address column. Should we impose a standard? 6 ■ Chapter 1 What Is Data Modeling? Answering questions of this kind is what data modeling is about. In some cases, there is a single, correct approach. Far more often, there will be several options. Asking the right questions (and coming up with the best answers) requires a detailed understanding of the relevant business area, as well as knowledge of data modeling principles and techniques.

Frequently the reason for redeveloping a system is that the underlying database either no longer accurately represents the business rules or requires costly ongoing maintenance to keep pace with change. A data model is stable in the face of a change to requirements if we do not need to modify it at all. We can sensibly talk of models being more or less stable, depending on the level of change required. A data model is flexible if it can be readily extended to accommodate likely new requirements with only minimal impact on the existing structure.

10 Who Should Be Involved in Data Modeling? In Part 2, we look more closely at the process of developing a data model within the context of the various approaches outlined in the previous section. 12 So-called because there is no going back. Once a step is completed, we move on to the next, with no intention of doing that step again. In contrast, an iterative approach allows for several passes through the cycle, refining the deliverables each time. 13 See, for example, Ambler, S. org. 24 ■ Chapter 1 What Is Data Modeling?

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Algorithms in SNOBOL4 by James F. Gimpel


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