Computing Queries from Derived Relations.

Per-Åke Larson, H. Z. Yang: Computing Queries from Derived Relations. VLDB 1985: 259-269

@inproceedings{DBLP:conf/vldb/LarsonY85,
  author    = {Per-{\AA}ke Larson and
               H. Z. Yang},
  editor    = {Alain Pirotte and
               Yannis Vassiliou},
  title     = {Computing Queries from Derived Relations},
  booktitle = {VLDB'85, Proceedings of 11th International Conference on Very
               Large Data Bases, August 21-23, 1985, Stockholm, Sweden},
  publisher = {Morgan Kaufmann},
  year      = {1985},
  pages     = {259-269},
  ee        = {db/conf/vldb/LarsonY85.html},
  crossref  = {DBLP:conf/vldb/85},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Assume that a set of derived relations are available in stored form. Given a query (or subquery), can it be computed from the derived rela- tions and, if so, how? Variants of this problem arise in several areas of query processing. Relation fragments stored at a site in a distributed database system, data- base snapshots, and intermediate results obtained dur- ing the processing of a query are all examples of stored, derived relations. In this paper we give neces- sary and sufficient conditions for when a query is com- putable from a single derived relation. It is assumed that both the query and the derived relation are defined by PSJ-expressions, that is, relational algebra expressions involving only projections, selections, and joins, in any combination. The solution is constructive: not only does it tell whether the query is computable or not, but it also shows how to compute it.

Copyright © 1985 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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Alain Pirotte, Yannis Vassiliou (Eds.): VLDB'85, Proceedings of 11th International Conference on Very Large Data Bases, August 21-23, 1985, Stockholm, Sweden. Morgan Kaufmann 1985
Contents

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