Encyclopedia of Database Systems

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

Skyline Queries and Pareto Optimality

  • Peng Peng
  • Raymond Chi-Wing Wong
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_80684

Synonyms

Pareto optimal tuples

Definition

Given two d-dimensional points p and q where d is a positive integer, p is said to dominate or Pareto-dominate q, denoted by p < q, if p is better than or equal to q on all dimensions and p is better than q on at least one of the d dimensions. Given a set D of d-dimensional points and a point p in D, p is said to be a skyline point in D if p is not dominated by any other points in D. A skyline query is to find all skyline points in D.

Each dimension can be numeric or categorical. If a dimension is numeric, all values in this dimension are totally ordered. For any two values in the dimension, one value is more preferable than the other value. One example of a numeric dimension is the price of a product where a smaller value is more preferable. Another example of a numeric dimension is the hotel class where a higher value is more preferable. If a dimension is categorical, the ordering on the values in this dimension is more complicated. One...

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Copyright information

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

Authors and Affiliations

  1. 1.AlibabaYu Hang District, HangzhouChina
  2. 2.Department of Computer Science and EngineeringThe Hong Kong University of Science and TechnologyClear Water BayHong Kong

Section editors and affiliations

  • Ihab Ilyas
    • 1
  1. 1.Cheriton School of Computer ScienceUniversity of WaterlooWaterlooCanada