HAS, a Relational Algebra Operator or Divide is not Enough to Conquer.

@inproceedings{DBLP:conf/icde/Carlis86,
  author    = {John V. Carlis},
  title     = {HAS, a Relational Algebra Operator or Divide is not Enough to
               Conquer},
  booktitle = {Proceedings of the Second International Conference on Data Engineering,
               February 5-7, 1986, Los Angeles, California, USA},
  publisher = {IEEE Computer Society},
  year      = {1986},
  isbn      = {0-8186-0655-X},
  pages     = {254-261},
  ee        = {db/conf/icde/Carlis86.html},
  crossref  = {DBLP:conf/icde/86},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Copyright © 1986 by The Institute of Electrical and Electronic Engineers, Inc. (IEEE). Abstract used with permission.

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References

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Anthony C. Klug: Equivalence of Relational Algebra and Relational Calculus Query Languages Having Aggregate Functions. J. ACM 29(3): 699-717(1982) BibTeX

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T. H. Merrett: The Extended Relational Algebra, a Basis for Query Languages. JCDKB 1978: 99- BibTeX

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