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From Causes for Database Queries to Repairs and Model-Based Diagnosis and Back Salimi, Babak Bertossi, Leopoldo causality,diagnosis,repairs,consistent query answering,integrity constraints 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. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Babak Salimi and Leopoldo Bertossi 2015 Is Part Of LIPIcs, Volume 31, 18th International Conference on Database Theory (ICDT 2015) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.ICDT.2015.342 urn:nbn:de:0030-drops-49948 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2015.342 eng https://creativecommons.org/licenses/by/3.0/legalcode