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Testing containment of object-oriented conjunctive queries is ∏ p2 -hard

  • Session 2B: Database
  • Conference paper
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Computing and Combinatorics (COCOON 1995)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 959))

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Abstract

We study the complexity of testing containment for a class of object-oriented conjunctive queries. We show that the containment problem is ∏ p2 -hard. Together with a previous result, the containment problem is complete in ∏ p2 .

Part of this work was done while the author visited NTT Basic Research Laboratories in Tokyo.

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References

  1. Chan, E.P.F., “Testing Satisfiability of a Class of Object-Oriented Conjunctive Queries,” Theoretical Computer Science (134), pp. 287–309, 1994.

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  3. Chan, E.P.F., “Containment and Optimization of Object-Preserving Conjunctive Queries,” TR-94-07, Department of Computer Science, University of Waterloo, 1994. An extended abstract appeared in Proceedings of ACM PODS 1992, pp. 192–202.

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Author information

Authors and Affiliations

  1. Department of Computer Science, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada

    Edward P. F. Chan

  2. Information Science Laboratory, NTT Basic Research Laboratories, Atsugi-shi, 243-01, Kanagawa, Japan

    Ron van der Meyden

Authors
  1. Edward P. F. Chan
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  2. Ron van der Meyden
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Editor information

Ding-Zhu Du Ming Li

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© 1995 Springer-Verlag Berlin Heidelberg

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Chan, E.P.F., van der Meyden, R. (1995). Testing containment of object-oriented conjunctive queries is ∏ p2 -hard. In: Du, DZ., Li, M. (eds) Computing and Combinatorics. COCOON 1995. Lecture Notes in Computer Science, vol 959. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0030822

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  • DOI: https://doi.org/10.1007/BFb0030822

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-60216-3

  • Online ISBN: 978-3-540-44733-7

  • eBook Packages: Springer Book Archive

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