Preference Handling in Database Systems -
      Achievements and Challenges
                                   Werner Kießling
                               Universität Augsburg
                       Datenbanken und Informationssysteme
                              Universitätsstraße 6a
                                86159 Augsburg
                    kiessling@informatik.uni-augsburg.de

                                      ABSTRACT
  One of the fundamental phenomena in life concerns the notion of a preference. Preferences
  are a central concept in decision making. Accordingly, the complexity of preference
  reasoning has challenged researchers from diverse disciplines ever since. During the past
  decade also in database systems this topic has emerged into a flourishing field. This talk
  will address several achievements that have been reached meanwhile. We will cover aspects
  like preference modeling and its integration into query languages such as Preference SQL,
  algebraic preference query optimization and efficient evaluation algorithms for numerical
  top-k processing and for skyline computation. Some further challenges towards situated
  preferences, semi-skylines or skyline snippets will addressed as well.




                           Copyright is held by the author/owner(s).
                     GvD Workshop’10, 25.-28.05.2010, Bad Helmstedt, Germany.