Chapter 6. The Logical Model
In this chapter we explore solutions to the implementation of the general conceptual model (GCM) in data warehouses. One of the key components of our model is the concept of retrospection that was introduced in the previous chapter. Various options as to how it might be implemented are explored in this chapter. In connection with retrospection, the subject of existence, which was discussed in Chapter 3, is developed and used to show how some of the queries that were very difficult, if not impossible, to express using the Type 2 method in Chapter 4, can be written successfully.
Also in this chapter, the solution is developed further to show how it can be transformed into a relational logical model.
In practice, the ...
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