Answering queries using views in the presence of functional dependencies

  • Authors:
  • Jun Hong;Weiru Liu;David Bell;Qingyuan Bai

  • Affiliations:
  • School of Computer Science, Queen's University Belfast, Belfast, UK;School of Computer Science, Queen's University Belfast, Belfast, UK;School of Computer Science, Queen's University Belfast, Belfast, UK;School of Computing and Mathematics, University of Ulster, Newtownabbey, Co. Antrim, UK

  • Venue:
  • BNCOD'05 Proceedings of the 22nd British National conference on Databases: enterprise, Skills and Innovation
  • Year:
  • 2005

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Abstract

This paper is concerned with the problem of answering queries using views in the presence of functional dependencies. Previous algorithms for answering queries using views, such as the MiniCon algorithm, have not taken into account the presence of functional dependencies. As a consequence, these algorithms may miss query rewritings in the presence of such dependencies. In this paper, we present an extension of the MiniCon algorithm to handle the presence of functional dependencies while still retaining the main properties of the algorithm and its computational advantage over the other algorithms.