By Joachim Biskup, Hans Hermann Brüggemann (auth.), Hervé Gallaire, Jack Minker, Jean Marie Nicolas (eds.)

ISBN-10: 1461593859

ISBN-13: 9781461593850

ISBN-10: 1461593875

ISBN-13: 9781461593874

This is the 3rd booklet dedicated to theoretical matters in facts­ bases that we've got edited. each one ebook has been the outgrowth of papers held at a workshop in Toulouse, France. the 1st workshop, held in 1977 targeted totally on the real subject of good judgment and databases. The ebook, common sense and Databases used to be the results of this attempt. the varied makes use of of good judgment for databases resembling its use as a theoretical foundation for databases, for deduction and for integ­ rity constraints formula and checking used to be defined within the chapters of the publication. The curiosity generated through the 1st workshop ended in the deci­ sion to behavior different workshops concerned about theoretical matters in databases. as well as common sense and databases the categories of papers have been improved to incorporate different very important theoretical matters comparable to dependency conception which, even though it occasionally makes use of good judgment as a foundation, doesn't healthy with our meant that means of common sense and databases explored on the first workshop. a result of broader assurance, and since we expected extra workshops, the second one e-book was once entitled, Advances in Database thought - quantity 1. The publication "Logic and Databases" will be thought of quantity zero of this series.

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And Ullman, J. D. '82) 343-360. 50 10. AUSIELLO, D'ATRI AND MOSCARINI Garey, M. R. and Johnson, D. [1979] computers and IntractFreeman, San Francisco, California (1979). ability, 11. Graham, M. H. [1979] "On the universal relation", unpublished memorandum, Dept. of Computer Science, University of Toronto, Canada (Sept. 1979). 12. Goodman, N. and Shmueli, o. [1982a] "Transforming cyclic schemas into trees", proceedings First SIGACT-SIGMOD ACM Symposium on principles of Database Systems, Los Angeles, California (March 1982) 49-54.

For instance, for input F = {A ~ B, A ~ C, A ~ D, BC ~ E, CD ~ F} our algorithm produces the output scheme ABC, ACD, BCE, CDF embodying the functional dependency A ~ C twice in ABC and ACD. In this case, we could merge ABC and ACD thus obtaining the scheme ABCD, BCE, CDE. (7) How does one incorporate merging of equivalent sides (cf. Algorithm 2 of Bernstein [1976])? (8) How does one use, respectively modify, other approaches to database design in order to obtain acyclic database schemes? left hand Recently Sacca [1982] thoroughly studied this problem for database schemes described by one full join dependency and a set of functional dependencies (as suggested in Fagin et al.

22. Ullman, J. D. [1~82] Principles of Database Systems, Second Edition, Computer Science Press, Potomac, Maryland (1982). 23. Ullman, J. D. [1983] "Universal relation interfaces for database systems", unpublished manuscript, Dept. of Computer Science, Stanford University, Stanford, California (1983). 24. Yannakakis, M. [1981] "Algorithms for acylic database schemes", Proceedings 7th Conference on Very Large Data Bases, Cannes, France (September 1981) 82-94. ELIMINATING CYCLES IN DATABASE SCHEMAS Yoshito Hanatani Institut National de Recherche en Informatique et en Automatique, Rocquencourt, France ABSTRACT Call J-schema (respectively M-schema) a schema that can be described by a single jOin-dependency (respectively by a set of multi-valued dependencies).

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Advances in Data Base Theory: Volume 2 by Joachim Biskup, Hans Hermann Brüggemann (auth.), Hervé Gallaire, Jack Minker, Jean Marie Nicolas (eds.)


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