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  1. No Access

    Chapter and Conference Paper

    Generalized Weighted Repairs

    This paper deals with the problem of repairing inconsistent relational database instances in which facts are associated with nonnegative weights, representing their quality or trustfulness. Given a numeric agg...

    Horacio Tellez Perez, Jef Wijsen in Flexible Query Answering Systems (2021)

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    Article

    Consistent Query Answering for Primary Keys in Datalog

    We study the complexity of consistent query answering on databases that may violate primary key constraints. A repair of such a database is any consistent database that can be obtained by deleting a minimal se...

    Paraschos Koutris, Jef Wijsen in Theory of Computing Systems (2021)

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    Reference Work Entry In depth

    Temporal Integrity Constraints

    Jef Wijsen in Encyclopedia of Database Systems (2018)

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    Reference Work Entry In depth

    Temporal Dependencies

    Jef Wijsen in Encyclopedia of Database Systems (2018)

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    Living Reference Work Entry In depth

    Temporal Dependencies

    Jef Wijsen in Encyclopedia of Database Systems

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    Living Reference Work Entry In depth

    Temporal Integrity Constraints

    Jef Wijsen in Encyclopedia of Database Systems

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    Chapter and Conference Paper

    First-Order Under-Approximations of Consistent Query Answers

    Consistent Query Answering (CQA) has by now been widely adopted as a principled approach for answering queries on inconsistent databases. The consistent answer to a query q on an inconsistent database ...

    Floris Geerts, Fabian Pijcke, Jef Wijsen in Scalable Uncertainty Management (2015)

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    Chapter and Conference Paper

    A Survey of the Data Complexity of Consistent Query Answering under Key Constraints

    This paper adopts a very elementary representation of uncertainty. A relational database is called uncertain if it can violate primary key constraints. A repair of an uncertain database is obtained by selectin...

    Jef Wijsen in Foundations of Information and Knowledge Systems (2014)

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    Book and Conference Proceedings

    Scalable Uncertainty Management

    7th International Conference, SUM 2013, Washington, DC, USA, September 16-18, 2013. Proceedings

    Weiru Liu, V. S. Subrahmanian, Jef Wijsen in Lecture Notes in Computer Science (2013)

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    Chapter and Conference Paper

    Certain Conjunctive Query Answering in SQL

    An uncertain database db is defined as a database in which distinct tuples of the same relation can agree on their primary key. A repair (or possible world) of db is then obtained by selecting a maximal number of...

    Alexandre Decan, Fabian Pijcke, Jef Wijsen in Scalable Uncertainty Management (2012)

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    Chapter and Conference Paper

    Uncertainty That Counts

    Uncertainty is modeled by a multibase (db,μ) where db is a database with zero or more primary key violations, and μ associates a multiplicity (a positive integer) to each fact of db. In data integration, the mult...

    Dany Maslowski, Jef Wijsen in Flexible Query Answering Systems (2011)

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    Reference Work Entry In depth

    Temporal Dependencies

    Jef Wijsen in Encyclopedia of Database Systems (2009)

  13. No Access

    Reference Work Entry In depth

    Temporal Integrity Constraints

    Jef Wijsen in Encyclopedia of Database Systems (2009)

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    Chapter and Conference Paper

    On the Consistent Rewriting of Conjunctive Queries Under Primary Key Constraints

    This article deals with the computation of consistent answers to queries on relational databases that violate primary key constraints. A repair of such inconsistent database is obtained by selecting a maximal ...

    Jef Wijsen in Database Programming Languages (2007)

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    Book and Conference Proceedings

    Current Trends in Database Technology – EDBT 2006

    EDBT 2006 Workshops PhD, DataX, IIDB, IIHA, ICSNW, QLQP, PIM, PaRMA, and Reactivity on the Web, Munich, Germany, March 26-31, 2006, Revised Selected Papers

    Torsten Grust, Hagen Höpfner in Lecture Notes in Computer Science (2006)

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    Chapter and Conference Paper

    Project-Join-Repair: An Approach to Consistent Query Answering Under Functional Dependencies

    Consistent query answering is the term commonly used for the problem of answering queries on databases that violate certain integrity constraints. We address this problem for universal re...

    Jef Wijsen in Flexible Query Answering Systems (2006)

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    Chapter and Conference Paper

    Making More Out of an Inconsistent Database

    Repairing a database means making the database consistent by applying changes that are as small as possible. Nearly all approaches to repairing have assumed deletions and insertions of entire tuples as basic r...

    Jef Wijsen in Advances in Databases and Information Systems (2004)

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    Chapter

    Logical Languages for Data Mining

    Data mining focuses on the development of methods and algorithms for such tasks as classification, clustering, rule induction, and discovery of associations. In the database field, the view of data mining as a...

    Fosca Giannotti, Giuseppe Manco in Logics for Emerging Applications of Databases (2004)

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    Chapter and Conference Paper

    Condensed Representation of Database Repairs for Consistent Query Answering

    Repairing a database means bringing the database in accordance with a given set of integrity constraints by applying modifications that are as small as possible. In the seminal work of Arenas et al. on query a...

    Jef Wijsen in Database Theory — ICDT 2003 (2003)

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    Chapter and Conference Paper

    On Monotone Data Mining Languages

    We present a simple Data Mining Logic (DML) that can express common data mining tasks, like “Find Boolean association rules” or “Find inclusion dependencies.” At the center of the paper is the problem of chara...

    Toon Calders, Jef Wijsen in Database Programming Languages (2002)

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