Browsing by Subject "Relational data model"

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    Modeling and querying temporal data
    (IGI Global, 2005) Tansel, Abdullah Uz; Rivero, L. C.; Doorn, J. H.; Ferraggine, V. E.
    The paper discusses modelling temporal variation of data in the context of the relational data model. This is done by employing time-stamps, which leads to two possible approaches: adding time-stamps to tuples and using first normal-form (1NF) relations, and adding time-stamps to attributes and using non-first normal form (NINF) relations. Modelling temporal data according to each approach with their respective data-manipulation operations are covered. This is followed by a discussion that includes the advantages and expressive power of each approach, the classification of temporal databases, and the handling of retroactive and postactive changes.