From Causes for Database Queries to Repairs and Model-Based Diagnosis and Back

Authors Babak Salimi, Leopoldo Bertossi

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Babak Salimi
Leopoldo Bertossi

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Babak Salimi and Leopoldo Bertossi. From Causes for Database Queries to Repairs and Model-Based Diagnosis and Back. In 18th International Conference on Database Theory (ICDT 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 31, pp. 342-362, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)


In this work we establish and investigate connections between causality for query answers in databases, database repairs wrt. denial constraints, and consistency-based diagnosis. The first two are relatively new problems in databases, and the third one is an established subject in knowledge representation. We show how to obtain database repairs from causes and the other way around. Causality problems are formulated as diagnosis problems, and the diagnoses provide causes and their responsibilities. The vast body of research on database repairs can be applied to the newer problem of determining actual causes for query answers and their responsibilities. These connections, which are interesting per se, allow us, after a transition-inspired by consistency-based diagnosis- to computational problems on hitting sets and vertex covers in hypergraphs, to obtain several new algorithmic and complexity results for database causality.
  • causality,diagnosis,repairs,consistent query answering,integrity constraints


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