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Published in:
2009 | OriginalPaper | Chapter
On Three Classes of Division Queries Involving Ordinal Preferences
Authors : Patrick Bosc, Olivier Pivert, Olivier Soufflet
Published in: Foundations of Intelligent Systems
Publisher: Springer Berlin Heidelberg
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In this paper, we are interested in taking preferences into account for a family of queries inspired by the relational division. A division query aims at retrieving the elements associated with a specified set of values and usually the results remain not discriminated. So, we suggest the introduction of preferences inside such queries with the following specificities: i) the user gives his/her preferences in an ordinal way and ii) the preferences apply to the divisor which is defined as a hierarchy of sets. Different uses of the hierarchy are investigated, which leads to queries conveying different semantics and the property of the result in terms of a quotient is studied. A special attention is paid to the implementation of such queries using a regular database management system and some experimental results illustrate the feasibility of the approach.