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        <article-title>Preference Handling in Database Systems - Achievements and Challenges</article-title>
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      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Werner Kießling</string-name>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>Universität Augsburg Datenbanken und Informationssysteme Universitätsstraße 6a 86159 Augsburg</institution>
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      <pub-date>
        <year>2010</year>
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      <p>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.</p>
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