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Time and Relational Theory by Nikos Lorentzos, Hugh Darwen, C.J. Date

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Chapter 18

Point and Interval Types Revisited

This chapter discusses a number of miscellaneous issues arising from the fundamental interval type notion and the related point type notion. First, it considers the possibility of supporting several distinct successor functions for “the same” point type; in particular, it shows how the concept of type inheritance can be used to support that possibility. It also considers the pragmatically important special case of intervals defined over points of type NUMERIC(p,q) for some precision p and scale factor q. This latter discussion leads to the need to extend the type inheritance concepts already discussed to deal with multiple inheritance. The chapter also revisits the notion of granularity from Chapter ...

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