ACM SIGMOD Anthology TODS dblp.uni-trier.de

Extended Algebra and Calculus for Nested Relational Databases.

Mark A. Roth, Henry F. Korth, Abraham Silberschatz: Extended Algebra and Calculus for Nested Relational Databases. ACM Trans. Database Syst. 13(4): 389-417(1988)
@article{DBLP:journals/tods/RothKS88,
  author    = {Mark A. Roth and
               Henry F. Korth and
               Abraham Silberschatz},
  title     = {Extended Algebra and Calculus for Nested Relational Databases},
  journal   = {ACM Trans. Database Syst.},
  volume    = {13},
  number    = {4},
  year      = {1988},
  pages     = {389-417},
  ee        = {http://doi.acm.org/10.1145/49346.49347, db/journals/tods/RothKS88.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX

Abstract

Relaxing the assumption that relations are always in First-Normal-Form (1NF) necessitates a reexamination of the fundamentals of relational database theory. In this paper we take a first step towards unifying the various theories of ¬1NF databases. We start by determining an appropriate model to couch our formalisms in. We then define an extended relational calculus as the theoretical basis for our ¬1NF database query language. We define a minimal extended relational algebra and prove its equivalence to the ¬1NF relational calculus. We define a class of ¬1NF relations with certain "good" properties and extend our algebra operators to work within this domain. We prove certain desirable equivalences that hold only if we restrict our language to this domain.

Copyright © 1988 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.


Joint ACM SIGMOD / IEEE Computer Society Anthology

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Discussion

Abdullah Uz Tansel, Lucy Garnett: On Roth, Korth, and Silberschatz's Extended Algebra and Calculus for Nested Relational Databases. ACM Trans. Database Syst. 17(2): 374-383(1992) BibTeX

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BibTeX

Referenced by

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  25. Abdullah Uz Tansel, Lucy Garnett: On Roth, Korth, and Silberschatz's Extended Algebra and Calculus for Nested Relational Databases. ACM Trans. Database Syst. 17(2): 374-383(1992)
  26. Jan Paredaens, Dirk Van Gucht: Converting Nested Algebra Expressions into Flat Algebra Expressions. ACM Trans. Database Syst. 17(1): 65-93(1992)
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  54. Stefano Ceri, Stefano Crespi-Reghizzi, Georg Gottlob, F. Lamperti, Luigi Lavazza, Letizia Tanca, Roberto Zicari: The Algres Project. EDBT 1988: 551-555
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