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Eine Sequelartige Sprachschnittstelle für Das NF2-Modell

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Sprachen für Datenbanken

Part of the book series: Informatik-Fachberichte ((INFORMATIK,volume 72))

Zusammenfassung

Im klassischen relationalen Daten-Modell wird üblicherweise die erste Normalform (INF) zwingend vorgeschrieben /Cod,Dat/. Diese Forderung ist keine für die Relationentheorie unabdingbare Voraussetzung /Ull/, wohl aber eine beträchtliche Vereinfachung. Es hat in der Vergangenheit nicht an Ansätzen für Datenmodelle gefehlt, die unnormalisierte Relationen zulassen /BFP, Mak, Kob/. Sie entwickelten sich insbesondere dort, wo die Einfachheit des klassischen relationalen Modells als Beschränkung empfunden wurde, etwa bei der Verwaltung technisch-wissenschatlicher Daten /Erb, LoPl/, bei “form models” für Büroinformationssysteme /LY, SLCT, Tsi/, oder in der integrierten Verwaltung formatierter und unformatierter (Text-)Daten /Sch/. Für diese Anwendungen bietet sich als übergreifendes Datenmodell das tabellenorientierte NF2-Modell /SchP/ an.

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Author information

Authors and Affiliations

  1. IBM Wissenschaftliches Zentrum Heidelberg, Tiergartenstrasse 15, D-6900, Heidelberg, Germany

    P. Pistor

  2. Department of Computer Science, Buildings 343–344, Technical University of Denmark, DK-2800, Lyngby, Denmark

    B. Hansen & M. Hansen

Authors
  1. P. Pistor
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  2. B. Hansen
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  3. M. Hansen
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Editor information

Editors and Affiliations

  1. Fachbereich Informatik, Universität Hamburg, Schlüterstraße 70, 2000, Hamburg 13, Germany

    J. W. Schmidt

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© 1983 Springer-Verlag Berlin Heidelberg

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Pistor, P., Hansen, B., Hansen, M. (1983). Eine Sequelartige Sprachschnittstelle für Das NF2-Modell. In: Schmidt, J.W. (eds) Sprachen für Datenbanken. Informatik-Fachberichte, vol 72. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69297-0_9

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  • DOI: https://doi.org/10.1007/978-3-642-69297-0_9

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-12733-8

  • Online ISBN: 978-3-642-69297-0

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