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Digress: A deductive interface to a relational database

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  • Stuart McLean
  • Charlotte Weise

Abstract

Databases with inferencing capabilities have a practical as well as a theoretical interest because they have the potential to combine the efficient use of secondary storage and multiuser controls common to database management systems with the capabilities of expert system technology. A relational database is a knowledge representation scheme in which deductive inferences are valid logical consequences of information contained in the database under the closed world assumption, the domain closure assumption, and the unique names assumption. Since the database relational calculus can be expressed as a first order language, it can be utilized to perform deductive reasoning. This article reviews the theoretical and practical justifications for providing current database technology with inferencing capabilities and reports on a current research project which implements a deductive retriever in INGRES, using the DBMS data manipulation language QUEL and its interface language EQUEL. © 1991 John Wiley & Sons, Inc.

Suggested Citation

  • Stuart McLean & Charlotte Weise, 1991. "Digress: A deductive interface to a relational database," Journal of the American Society for Information Science, Association for Information Science & Technology, vol. 42(1), pages 49-63, January.
    • Handle: RePEc:bla:jamest:v:42:y:1991:i:1:p:49-63
    DOI: 10.1002/(SICI)1097-4571(199101)42:13.0.CO;2-Y
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