Specifying Queries as Relational Expressions: The SQUARE Data Sublanguage.

@article{DBLP:journals/cacm/BoyceCKH75,
  author    = {Raymond F. Boyce and
               Donald D. Chamberlin and
               W. Frank King III and
               Michael Hammer},
  title     = {Specifying Queries as Relational Expressions: The SQUARE Data
               Sublanguage},
  journal   = {Commun. ACM},
  volume    = {18},
  number    = {11},
  year      = {1975},
  pages     = {621-628},
  ee        = {db/journals/cacm/BoyceCKH75.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Copyright © 1975 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.

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Referenced by

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   Contents
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   Contents
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15. Larry Kerschberg, Anthony C. Klug, Dennis Tsichritzis: A Taxonomy of Data Models. VLDB 1976: 43-64
16. H. Rex Hartson, David K. Hsiao: A Semantic Model for Data Base Protection Languages. VLDB 1976: 27-42
17. Claude Deheneffe, Henri Hennebert: NUL: A Navigational User's Language for a Network Structured Data Base. SIGMOD Conference 1976: 135-142
18. Dennis Tsichritzis: Features of a Conceptual Schema. VLDB 1975: 532-534