Semantically Correct Query Answers in the Presence of Null Values

  title={Semantically Correct Query Answers in the Presence of Null Values},
  author={Loreto Bravo and Leopoldo E. Bertossi},
  booktitle={EDBT Workshops},
For several reasons a database may not satisfy a given set of integrity constraints (ICs), but most likely most of the information in it is still consistent with those ICs; and could be retrieved when queries are answered. Consistent answers to queries wrt a set of ICs have been characterized as answers that can be obtained from every possible minimally repaired consistent version of the original database. In this paper we consider databases that contain null values and are also repaired, if… CONTINUE READING
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