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Aggregate Queries Over Conditional Tables

Published: 01 November 2002 Publication History

Abstract

Conditional tables have been identified long ago as a way to capture unknown or incomplete information. However, queries over conditional tables have never been allowed to involve column functions such as aggregates. In this paper, the theory of conditional tables is extended in this direction, and it is shown that a strong representation system exists which has the closure property that the result of an aggregate query over a conditional table can be again represented by a conditional table. It turns out, however, that the number of tuples in a conditional table representing the result of an aggregate query may grow exponentially in the number of variables in the table. This phenomenon is analyzed in detail, and tight upper and lower bounds concerning the number of tuples contained in the result of an aggregate query are given. Finally, representation techniques are sketched that approximate aggregation results in tables of reasonable size.

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Published In

cover image Journal of Intelligent Information Systems
Journal of Intelligent Information Systems  Volume 19, Issue 3
November 2002
94 pages

Publisher

Kluwer Academic Publishers

United States

Publication History

Published: 01 November 2002

Author Tags

  1. aggregate query
  2. data warehouse
  3. database
  4. incomplete information

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  • (2023)Efficient Approximation of Certain and Possible Answers for Ranking and Window Queries over Uncertain DataProceedings of the VLDB Endowment10.14778/3583140.358315116:6(1346-1358)Online publication date: 20-Apr-2023
  • (2021)Efficient Uncertainty Tracking for Complex Queries with Attribute-level BoundsProceedings of the 2021 International Conference on Management of Data10.1145/3448016.3452791(528-540)Online publication date: 9-Jun-2021
  • (2012)Aggregation in probabilistic databases via knowledge compilationProceedings of the VLDB Endowment10.14778/2140436.21404455:5(490-501)Online publication date: 1-Jan-2012
  • (2011)Capturing continuous data and answering aggregate queries in probabilistic XMLACM Transactions on Database Systems10.1145/2043652.204365836:4(1-45)Online publication date: 19-Dec-2011
  • (2011)Provenance for aggregate queriesProceedings of the thirtieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems10.1145/1989284.1989302(153-164)Online publication date: 13-Jun-2011
  • (2010)Explaining missing answers to SPJUA queriesProceedings of the VLDB Endowment10.14778/1920841.19208693:1-2(185-196)Online publication date: 1-Sep-2010
  • (2010)Aggregate queries for discrete and continuous probabilistic XMLProceedings of the 13th International Conference on Database Theory10.1145/1804669.1804679(50-61)Online publication date: 23-Mar-2010
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  • (2008)Bag-based data models for incomplete information and their closure propertiesJournal of Intelligent Information Systems10.1007/s10844-006-0020-130:2(115-135)Online publication date: 1-Apr-2008
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