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Optimization of Real Conjunctive Queries.

Surajit Chaudhuri, Moshe Y. Vardi: Optimization of Real Conjunctive Queries. PODS 1993: 59-70
@inproceedings{DBLP:conf/pods/ChaudhuriV93,
  author    = {Surajit Chaudhuri and
               Moshe Y. Vardi},
  title     = {Optimization of {\it Real} Conjunctive Queries},
  booktitle = {Proceedings of the Twelfth ACM SIGACT-SIGMOD-SIGART Symposium
               on Principles of Database Systems, May 25-28, 1993, Washington,
               DC},
  publisher = {ACM Press},
  year      = {1993},
  isbn      = {0-89791-593-3},
  pages     = {59-70},
  ee        = {http://doi.acm.org/10.1145/153850.153856, db/conf/pods/ChaudhuriV93.html},
  crossref  = {DBLP:conf/pods/93},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX

Abstract

The optimization problem for conjunctive queries has been studied extensively. Unfortunately, this research almost invariably assumes set-theoretic semantics (i.e., duplicates are eliminated). In contrast, SQL queries have bag-theoretic semantics (i.e., in general duplicates are not eliminated). In this paper we study the optimization problems for conjunct ive queries under bag-theoretic semantics. We show that optimization techniques from the set-theoretic setting do not carry over to the bag-theoretic setting.

Copyright © 1993 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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Proceedings of the Twelfth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 25-28, 1993, Washington, DC. ACM Press 1993, ISBN 0-89791-593-3
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References

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Referenced by

  1. Stéphane Grumbach, Maurizio Rafanelli, Leonardo Tininini: Querying Aggregate Data. PODS 1999: 174-184
  2. Sara Cohen, Werner Nutt, Alexander Serebrenik: Rewriting Aggregate Queries Using Views. PODS 1999: 155-166
  3. Renée J. Miller: Using Schematically Heterogeneous Structures. SIGMOD Conference 1998: 189-200
  4. Werner Nutt, Yehoshua Sagiv, Sara Shurin: Deciding Equivalences Among Aggregate Queries. PODS 1998: 214-223
  5. Nieves R. Brisaboa, Héctor J. Hernández, José R. Paramá, Miguel R. Penabad: Containment of Conjunctive Queries with Built-in Predicates with Variables and Constants over any Ordered Domain. ADBIS 1998: 46-57
  6. Alon Y. Levy, Dan Suciu: Deciding Containment for Queries with Complex Objects. PODS 1997: 20-31
  7. Oscar H. Ibarra, Jianwen Su: On the Containment and Equivalence of Database Queries with Linear Constraints. PODS 1997: 32-43
  8. Gösta Grahne, Nicolas Spyratos, Daniel Stamate: Semantics and Containment with Internal and External Conjunctions. ICDT 1997: 71-82
  9. Guozhu Dong, Leonid Libkin, Limsoon Wong: Local Properties of Query Languages. ICDT 1997: 140-154
  10. Latha S. Colby, Leonid Libkin: Tractable Iteration Mechanisms for Bag Languages. ICDT 1997: 461-475
  11. Divesh Srivastava, Shaul Dar, H. V. Jagadish, Alon Y. Levy: Answering Queries with Aggregation Using Views. VLDB 1996: 318-329
  12. Yannis E. Ioannidis, Raghu Ramakrishnan: Containment of Conjunctive Queries: Beyond Relations as Sets. ACM Trans. Database Syst. 20(3): 288-324(1995)
  13. Serge Abiteboul, Richard Hull, Victor Vianu: Foundations of Databases. Addison-Wesley 1995, ISBN 0-201-53771-0
    Contents
  14. Val Tannen: Tutorial: Languages for Collection Types. PODS 1994: 150-154
  15. Leonid Libkin, Limsoon Wong: New Techniques for Studying Set Languages, Bag Languages and Aggregate Functions. PODS 1994: 155-166
  16. Stéphane Grumbach, Tova Milo, Yoram Kornatzky: Calculi for Bags and their Complexity. DBPL 1993: 65-79
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