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Aggregate Queries over Conditional Tables
1999 (English)Report (Refereed)
Abstract [en]

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. As an application, the area of data warehouses is discussed,

which is of increasing importance in many commercial applications these

days, but which still lacks proper ways of handling incomplete

information.

Place, publisher, year, edition, pages
Karlstad University Studies , 1999.
National Category
Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-16785OAI: oai:DiVA.org:kau-16785DiVA: diva2:590378
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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CiteExportLink to record
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Citation style
  • apa
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