Database Repairing And Consistent Query Answering

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Database Repairing and Consistent Query Answering

Author : Leopoldo Bertossi
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1608457621
Total Pages : 124 pages
Book Rating : 4.6/5 (84 download)

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Book Synopsis Database Repairing and Consistent Query Answering by : Leopoldo Bertossi

Download or read book Database Repairing and Consistent Query Answering written by Leopoldo Bertossi and published by Morgan & Claypool Publishers. This book was released on 2011 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely, a large portion of the database is still semantically correct, in a sense that has to be made precise. After having provided a formal characterization of consistent data in an inconsistent database, the natural problem emerges of extracting that semantically correct data, as query answers. The consistent data in an inconsistent database is usually characterized as the data that persists across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from all the database repairs. As expected, the notion of repair requires an adequate notion of distance that allows for the comparison of databases with respect to how much they differ from the inconsistent instance. On this basis, the minimality condition on repairs can be properly formulated. In this monograph we present and discuss these fundamental concepts, different repair semantics, algorithms for computing consistent answers to queries, and also complexity-theoretic results related to the computation of repairs and doing consistent query answering. Table of Contents: Introduction / The Notions of Repair and Consistent Answer / Tractable CQA and Query Rewriting / Logically Specifying Repairs / Decision Problems in CQA: Complexity and Algorithms / Repairs and Data Cleaning

Database Repairs and Consistent Query Answering

Author : Leopoldo Bertossi
Publisher : Springer Nature
ISBN 13 : 3031018834
Total Pages : 105 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Database Repairs and Consistent Query Answering by : Leopoldo Bertossi

Download or read book Database Repairs and Consistent Query Answering written by Leopoldo Bertossi and published by Springer Nature. This book was released on 2022-05-31 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely, a large portion of the database is still semantically correct, in a sense that has to be made precise. After having provided a formal characterization of consistent data in an inconsistent database, the natural problem emerges of extracting that semantically correct data, as query answers. The consistent data in an inconsistent database is usually characterized as the data that persists across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from all the database repairs. As expected, the notion of repair requires an adequate notion of distance that allows for the comparison of databases with respect to how much they differ from the inconsistent instance. On this basis, the minimality condition on repairs can be properly formulated. In this monograph we present and discuss these fundamental concepts, different repair semantics, algorithms for computing consistent answers to queries, and also complexity-theoretic results related to the computation of repairs and doing consistent query answering. Table of Contents: Introduction / The Notions of Repair and Consistent Answer / Tractable CQA and Query Rewriting / Logically Specifying Repairs / Decision Problems in CQA: Complexity and Algorithms / Repairs and Data Cleaning

Repairing and Querying Databases under Aggregate Constraints

Author : Sergio Flesca
Publisher : Springer Science & Business Media
ISBN 13 : 1461416418
Total Pages : 66 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis Repairing and Querying Databases under Aggregate Constraints by : Sergio Flesca

Download or read book Repairing and Querying Databases under Aggregate Constraints written by Sergio Flesca and published by Springer Science & Business Media. This book was released on 2011-10-20 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research has deeply investigated several issues related to the use of integrity constraints on relational databases. In particular, a great deal of attention has been devoted to the problem of extracting "reliable" information from databases containing pieces of information inconsistent with regard to some integrity constraints. In this manuscript, the problem of extracting consistent information from relational databases violating integrity constraints on numerical data is addressed. Aggregate constraints defined as linear inequalities on aggregate-sum queries on input data are considered. The notion of repair as consistent set of updates at attribute-value level is exploited, and the characterization of several data-complexity issues related to repairing data and computing consistent query answers is provided. Moreover, a method for computing “reasonable” repairs of inconsistent numerical databases is introduced, for a restricted but expressive class of aggregate constraints. An extension of this method for dealing with the data repairing problem in the presence of weak aggregate constraints which are expected to be satisfied, but not required to, is presented. Furthermore, a technique for computing consistent answers of aggregate queries in the presence of a wide form of aggregate constraints is provided. Finally, extensions of the framework as well as several open problems are discussed.

Flexible Query Answering Systems

Author : Henrik Legind Larsen
Publisher : Springer Science & Business Media
ISBN 13 : 3540346384
Total Pages : 730 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Flexible Query Answering Systems by : Henrik Legind Larsen

Download or read book Flexible Query Answering Systems written by Henrik Legind Larsen and published by Springer Science & Business Media. This book was released on 2006-05-30 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceeding of the 7th International Conference on Flexible Query Answering Systems, FQAS 2006, held in Milan, Italy in June 2006. The 60 revised full papers presented were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on flexibility in database management and quering, vagueness and uncertainty in XML quering and retrieval, information retrieval and filtering, multimedia information access, user modeling and personalization, knowledge and data extraction, intelligent information extraction from text, and knowledge representation and reasoning.

Flexible Query Answering Systems

Author : Troels Andreasen
Publisher : Springer Nature
ISBN 13 : 3030869679
Total Pages : 245 pages
Book Rating : 4.0/5 (38 download)

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Book Synopsis Flexible Query Answering Systems by : Troels Andreasen

Download or read book Flexible Query Answering Systems written by Troels Andreasen and published by Springer Nature. This book was released on 2021-09-15 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 14th International Conference on Flexible Query Answering Systems, FQAS 2021, held virtually and in Bratislava, Slovakia, in September 2021. The 16 full papers and 1 perspective papers presented were carefully reviewed and selected from 17 submissions. They are organized in the following topical sections: model-based flexible query answering approaches and data-driven approaches.

Theory and Applications of Satisfiability Testing – SAT 2016

Author : Nadia Creignou
Publisher : Springer
ISBN 13 : 3319409700
Total Pages : 564 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis Theory and Applications of Satisfiability Testing – SAT 2016 by : Nadia Creignou

Download or read book Theory and Applications of Satisfiability Testing – SAT 2016 written by Nadia Creignou and published by Springer. This book was released on 2016-06-10 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 19th International Conference on Theory and Applications of Satisfiability Testing, SAT 2016, held in Bordeaux, France, in July 2016. The 31 regular papers, 5 tool papers presented together with 3 invited talks were carefully reviewed and selected from 70 submissions. The papers address different aspects of SAT, including complexity, satisfiability solving, satisfiability applications, satisfiability modulop theory, beyond SAT, quantified Boolean formula, and dependency QBF.

Trends in Cleaning Relational Data

Author : Ihab F Ilyas
Publisher :
ISBN 13 : 9781680830231
Total Pages : pages
Book Rating : 4.8/5 (32 download)

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Book Synopsis Trends in Cleaning Relational Data by : Ihab F Ilyas

Download or read book Trends in Cleaning Relational Data written by Ihab F Ilyas and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flexible Query Answering Systems

Author : Henrik L. Larsen
Publisher : Springer Science & Business Media
ISBN 13 : 3790818348
Total Pages : 617 pages
Book Rating : 4.7/5 (98 download)

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Book Synopsis Flexible Query Answering Systems by : Henrik L. Larsen

Download or read book Flexible Query Answering Systems written by Henrik L. Larsen and published by Springer Science & Business Media. This book was released on 2012-08-27 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the proceedings of the Fourth International Conference on Flexible Query Answering Systems, FQAS'2000, held in Warsaw, Poland on October 25 - 28, 2000. The FQAS conference has been the premier conference focusing on one of key issues that the information society faces, namely that of providing easy, flexible, intuitive access to information for everybody. In targeting this issue, the conference draws on several research areas, such as databases, querying, information retrieval, knowledge representation, soft computing, cyberspace, multimedia systems, human-computer interaction, etc. FQAS'2000 has been preceded by the extremely successful FQAS'94, FQAS'96 and FQAS'98 conferences all held in Roskilde, Denmark. The present conference provides a unique opportunity for researchers, developers and practitioners to explore new ideas and approaches in a multidisciplinary forum. As a metaphor for flexible query answering we may consider a human intermediary who has expertise in the topic of the query, and is experienced in identifying the user's information needs and answering the needs from the available information resources. The use of knowledge on relevant contexts, available information resources, etc. , enables the expert to respond rather precisely to the needs, though the query, per se, may be imprecise, incomplete, etc. Thus, a key issue for flexible query answering system is to obtain, maintain, represent, and utilize such knowledge. This comprises domain knowledge and metaknowledge, its representation and organization in ontologies, terminologies, etc.

Theory and Applications of Satisfiability Testing – SAT 2019

Author : Mikoláš Janota
Publisher : Springer
ISBN 13 : 3030242587
Total Pages : 425 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Theory and Applications of Satisfiability Testing – SAT 2019 by : Mikoláš Janota

Download or read book Theory and Applications of Satisfiability Testing – SAT 2019 written by Mikoláš Janota and published by Springer. This book was released on 2019-06-28 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 22nd International Conference on Theory and Applications of Satisfiability Testing, SAT 2019, held in Lisbon, Portugal, UK, in July 2019. The 19 revised full papers presented together with 7 short papers were carefully reviewed and selected from 64 submissions. The papers address different aspects of SAT interpreted in a broad sense, including (but not restricted to) theoretical advances (such as exact algorithms, proof complexity, and other complexity issues), practical search algorithms, knowledge compilation, implementation-level details of SAT solvers and SAT-based systems, problem encodings and reformulations, applications (including both novel application domains and improvements to existing approaches), as well as case studies and reports on findings based on rigorous experimentation.

Scalable Uncertainty Management

Author : Eyke Hüllermeier
Publisher : Springer
ISBN 13 : 3642333621
Total Pages : 662 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Scalable Uncertainty Management by : Eyke Hüllermeier

Download or read book Scalable Uncertainty Management written by Eyke Hüllermeier and published by Springer. This book was released on 2012-09-11 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 6th International Conference on Scalable Uncertainty Management, SUM 2012, held in Marburg, Germany, in September 2012. The 41 revised full papers and 13 revised short papers were carefully reviewed and selected from 75 submissions. The papers cover topics in all areas of managing and reasoning with substantial and complex kinds of uncertain, incomplete or inconsistent information including applications in decision support systems, machine learning, negotiation technologies, semantic web applications, search engines, ontology systems, information retrieval, natural language processing, information extraction, image recognition, vision systems, data and text mining, and the consideration of issues such as provenance, trust, heterogeneity, and complexity of data and knowledge.

Database Theory - ICDT 2003

Author : Diego Calvanese
Publisher : Springer
ISBN 13 : 3540362851
Total Pages : 466 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Database Theory - ICDT 2003 by : Diego Calvanese

Download or read book Database Theory - ICDT 2003 written by Diego Calvanese and published by Springer. This book was released on 2003-07-01 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 9th International Conference on Database Theory, ICDT 2002, held in Siena, Italy in January 2002. The 26 revised full papers presented together with 3 invited articles were carefully reviewed and selected from 92 submissions. The papers are organized in topical sections on reasoning about XML schemas and queries, aggregate queries, query evaluation, query rewriting and reformulation, semistructured versus structured data, query containment, consistency and incompleteness, and data structures.

Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV

Author : Abdelkader Hameurlain
Publisher : Springer Nature
ISBN 13 : 3662680149
Total Pages : 141 pages
Book Rating : 4.6/5 (626 download)

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Book Synopsis Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV by : Abdelkader Hameurlain

Download or read book Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV written by Abdelkader Hameurlain and published by Springer Nature. This book was released on 2023-10-23 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The LNCS journal Transactions on Large-scale Data and Knowledge-centered Systems focuses on data management, knowledge discovery, and knowledge processing, which are core and hot topics in computer science. Since the 1990s, the Internet has become the main driving force behind application development in all domains. An increase in the demand for resource sharing across different sites connected through networks has led to an evolution of data- and knowledge-management systems from centralized systems to decentralized systems enabling large-scale distributed applications providing high scalability. This, the 54th issue of Transactions on Large-Scale Data and Knowledge-Centered Systems, contains three fully revised and extended papers and two additional extended keynotes selected from the 38th conference on Data Management - Principles, Technologies and Applications, BDA 2022. The topics cover a wide range of timely data management research topics on temporal graph management, tensor-based data mining, time-series prediction, healthcare analytics over knowledge graphs, and explanation of database query answers.

Flexible Query Answering Systems

Author : Alfredo Cuzzocrea
Publisher : Springer Nature
ISBN 13 : 3030276295
Total Pages : 414 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Flexible Query Answering Systems by : Alfredo Cuzzocrea

Download or read book Flexible Query Answering Systems written by Alfredo Cuzzocrea and published by Springer Nature. This book was released on 2019-09-11 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 13th International Conference on Flexible Query Answering Systems, FQAS 2019, held in Amantea, Italy, in July 2019. The 27 full papers and 10 short papers presented were carefully reviewed and selected from 43 submissions. The papers present emerging research trends with a special focus on flexible querying and analytics for smart cities and smart societies in the age of big data. They are organized in the following topical sections: flexible database management and querying; ontologies and knowledge bases; social networks and social media; argumentation-based query answering; data mining and knowledge discovery; advanced flexible query answering methodologies and techniques; flexible query answering methods and techniques; flexible intelligent information-oriented and network-oriented approaches; big data veracity and soft computing; flexibility in tools; and systems and miscellanea.

ECAI 2012

Author : C. Bessiere
Publisher : IOS Press
ISBN 13 : 1614990980
Total Pages : 1056 pages
Book Rating : 4.6/5 (149 download)

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Book Synopsis ECAI 2012 by : C. Bessiere

Download or read book ECAI 2012 written by C. Bessiere and published by IOS Press. This book was released on 2012-08-15 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt: Artificial intelligence (AI) plays a vital part in the continued development of computer science and informatics. The AI applications employed in fields such as medicine, economics, linguistics, philosophy, psychology and logical analysis, not forgetting industry, are now indispensable for the effective functioning of a multitude of systems. This book presents the papers from the 20th biennial European Conference on Artificial Intelligence, ECAI 2012, held in Montpellier, France, in August 2012. The ECAI conference remains Europe's principal opportunity for researchers and practitioners of Artificial Intelligence to gather and to discuss the latest trends and challenges in all subfields of AI, as well as to demonstrate innovative applications and uses of advanced AI technology. ECAI 2012 featured four keynote speakers, an extensive workshop program, seven invited tutorials and the new Frontiers of Artificial Intelligence track, in which six invited speakers delivered perspective talks on particularly interesting new research results, directions and trends in Artificial Intelligence or in one of its related fields. The proceedings of PAIS 2012 and the System Demonstrations Track are also included in this volume, which will be of interest to all those wishing to keep abreast of the latest developments in the field of AI.

Database Theory – ICDT 2007

Author : Thomas Schwentick
Publisher : Springer Science & Business Media
ISBN 13 : 354069269X
Total Pages : 429 pages
Book Rating : 4.5/5 (46 download)

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Book Synopsis Database Theory – ICDT 2007 by : Thomas Schwentick

Download or read book Database Theory – ICDT 2007 written by Thomas Schwentick and published by Springer Science & Business Media. This book was released on 2006-12-21 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 11th International Conference on Database Theory, ICDT 2007, held in Barcelona, Spain in January 2007. The 25 revised papers presented together with 3 invited papers were carefully reviewed and selected from 111 submissions. The papers are organized in topical sections on information integration and peer to peer, axiomatizations for XML, expressive power of query languages, incompleteness, inconsistency, and uncertainty, XML schemas and typechecking, stream processing and sequential query processing, ranking, XML update and query, as well as query containment.

Encyclopedia of Database Technologies and Applications

Author : Rivero, Laura C.
Publisher : IGI Global
ISBN 13 : 1591407958
Total Pages : 784 pages
Book Rating : 4.5/5 (914 download)

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Book Synopsis Encyclopedia of Database Technologies and Applications by : Rivero, Laura C.

Download or read book Encyclopedia of Database Technologies and Applications written by Rivero, Laura C. and published by IGI Global. This book was released on 2005-06-30 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Addresses the evolution of database management, technologies and applications along with the progress and endeavors of new research areas."--P. xiii.

On the Move to Meaningful Internet Systems: OTM 2013 Conferences

Author : Robert Meersman
Publisher : Springer
ISBN 13 : 3642410308
Total Pages : 802 pages
Book Rating : 4.6/5 (424 download)

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Book Synopsis On the Move to Meaningful Internet Systems: OTM 2013 Conferences by : Robert Meersman

Download or read book On the Move to Meaningful Internet Systems: OTM 2013 Conferences written by Robert Meersman and published by Springer. This book was released on 2013-09-20 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the refereed proceedings of the confederated international conferences: Cooperative Information Systems (CoopIS 2013), Distributed Objects and Applications (DOA-Trusted Cloud 2013), and Ontologies, Data Bases and Applications of SEmantics (ODBASE 2013) held as part of OTM 2013 in September 2013 in Graz, Austria. The 47 revised full papers presented together with 6 short papers and 5 keynotes were carefully reviewed and selected from a total of 137 submissions. The papers are organized in topical sections on business process management; process modelling; service management; social networking; models and schemas; technical advances in cloud computing; towards trusted cloud computing; privacy for the cloud; querying and mining semantic information; semantic matching and mapping; semantic information management; semantics in use.