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Time and Relational Theory, 2nd Edition by Nikos Lorentzos, Hugh Darwen, C.J. Date

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Chapter 12

Database Design I: Structure

This chapter is the first of three devoted to the topic of logical database design in the temporal context. Database design in that context has the potential to be a much more complicated matter than its analog in the conventional (nontemporal) context. There are several reasons for this state of affairs, including (a) the need to deal with the fact that different “properties” of the same “entity” tend to vary at different rates and (b) the need to deal with the concept of “until further notice”—i.e., the need to be able to record the fact that a given “property” of a given “entity” has a given value right now and will continue to have that same value until some unknown time in the future. The chapter proposes ...

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