Query Transformation for PSJ-Queries.

H. Z. Yang, Per-Åke Larson: Query Transformation for PSJ-Queries. VLDB 1987: 245-254

@inproceedings{DBLP:conf/vldb/YangL87,
  author    = {H. Z. Yang and
               Per-{\AA}ke Larson},
  editor    = {Peter M. Stocker and
               William Kent and
               Peter Hammersley},
  title     = {Query Transformation for PSJ-Queries},
  booktitle = {VLDB'87, Proceedings of 13th International Conference on Very
               Large Data Bases, September 1-4, 1987, Brighton, England},
  publisher = {Morgan Kaufmann},
  year      = {1987},
  isbn      = {0-934613-46-X},
  pages     = {245-254},
  ee        = {db/conf/vldb/YangL87.html},
  crossref  = {DBLP:conf/vldb/87},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Consider a database containing not only base relations but also derived relations (also called materialized or concrete views). Relation fragments in a distributed database, view indexes, and intermediate results obtained during query procsssing are all examples of derived relations. The query transformation problem is then the following: Given a query (or a subquery), can it be computed from the available set of derived relations, and, if so, how? We have solved the query transformation problem for the case when both the query and the derived relations are defined by PSJ-expressions, that is, relational algebra expressions containing only projects, selects and joins. This paper gives an overview of the underlying theory, shows how to reduce the number of attribute mappings to be considered, and presents a prototype system for query transformation.

Copyright © 1987 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.

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Peter M. Stocker, William Kent, Peter Hammersley (Eds.): VLDB'87, Proceedings of 13th International Conference on Very Large Data Bases, September 1-4, 1987, Brighton, England. Morgan Kaufmann 1987, ISBN 0-934613-46-X
Contents

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Contents
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