Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Preference Queries

  • Jan Chomicki
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_80687

Synonyms

Ranking queries

Definition

A preference query is a query obtained by augmenting a database query with user-defined preferences (preference specification), so that the preference query returns not all the answers but only the best, most preferred answers. For example, given a binary preference relation, a winnow preference query may return all the undominated tuples belonging to the input (all the tuples to which no tuples in the input are preferred). As another example, given a numeric scoring function a preference Top-K query returns K answers, if available, with the highest scores. Note: Top-K queries are not considered in this article because they are covered in a separate article.

Historical Background

An early paper [1] viewed preference queries in the context of relational query relaxation. The answers satisfying the query condition would be the best; the answers obtained by progressively weakening the query condition would be less and less preferred. So in the absence...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Computer Science and EngineeringState University of New York at BuffaloBuffaloUSA