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Designing a Data Warehouse: Supporting Customer Relationship Management by Chris Todman

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EVALUATION AND SUMMARY OF THE LOGICAL MODEL

This chapter has focused on the implementation of the solutions that were introduced into the conceptual model in Chapter 5.

Principally, Chapter 6 has focused on the implementation of retrospection. We have seen how true retrospection can be implemented by the use of existence attributes and how the use of such attributes enables queries to be expressed that are otherwise very difficult to write and impossible to generalize using the approach adopted generally by practitioners. Existence attributes can be described as selective attribute timestamps that are applied only where needed. In the pursuit of accuracy, the implementation of true retrospection has enabled a very much greater level of accuracy ...

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