Database Repairs 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.

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.

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.

Semantics in Databases

Author : Leopoldo Bertossi
Publisher : Springer Science & Business Media
ISBN 13 : 3540009574
Total Pages : 237 pages
Book Rating : 4.5/5 (4 download)

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Book Synopsis Semantics in Databases by : Leopoldo Bertossi

Download or read book Semantics in Databases written by Leopoldo Bertossi and published by Springer Science & Business Media. This book was released on 2003-04-07 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-proceedings of the Second International Workshop on Semantics in Databases, held in Dagstuhl Castle, Germany, in January 2001. The 10 revised full papers presented together with an introduction by the volume editors were carefully selected during two rounds of reviewing. Among the aspects of database semantics discussed are semantic constraints, paraconsistency, logic foundations of databases, ER modeling, type hierarchies, null values, consistency enforcement, logic-based pattern languages, and semantic classification of queries. Among the classes of databases dealt with are deductive databases, relational databases, distributed information systems, and tree-structured data.

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.

Database Theory - ICDT 2003

Author : Diego Calvanese
Publisher : Springer Science & Business Media
ISBN 13 : 3540003231
Total Pages : 466 pages
Book Rating : 4.5/5 (4 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 Science & Business Media. This book was released on 2003-02-12 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.

Reasoning Web. Declarative Artificial Intelligence

Author : Mantas Šimkus
Publisher : Springer Nature
ISBN 13 : 3030954811
Total Pages : 194 pages
Book Rating : 4.0/5 (39 download)

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Book Synopsis Reasoning Web. Declarative Artificial Intelligence by : Mantas Šimkus

Download or read book Reasoning Web. Declarative Artificial Intelligence written by Mantas Šimkus and published by Springer Nature. This book was released on 2022-01-31 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the Reasoning Web Summer School is to disseminate recent advances on reasoning techniques and related issues that are of particular interest to Semantic Web and Linked Data applications. It is primarily intended for postgraduate students, postdocs, young researchers, and senior researchers wishing to deepen their knowledge. As in the previous years, lectures in the summer school were given by a distinguished group of expert lecturers. The broad theme of this year's summer school was again “Declarative Artificial Intelligence” and it covered various aspects of ontological reasoning and related issues that are of particular interest to Semantic Web and Linked Data applications. The following eight lectures were presented during the school: Foundations of Graph Path Query Languages; On Combining Ontologies and Rules; Modelling Symbolic Knowledge Using Neural Representations; Mining the Semantic Web with Machine Learning: Main Issues That Need to Be Known; Temporal ASP: From Logical Foundations to Practical Use with telingo; A Review of SHACL: From Data Validation to Schema Reasoning for RDF Graphs; and Score-Based Explanations in Data Management and Machine Learning.

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.

Scalable Uncertainty Management

Author : Sergio Greco
Publisher : Springer
ISBN 13 : 3540879935
Total Pages : 411 pages
Book Rating : 4.5/5 (48 download)

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Book Synopsis Scalable Uncertainty Management by : Sergio Greco

Download or read book Scalable Uncertainty Management written by Sergio Greco and published by Springer. This book was released on 2008-10-01 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Second International Conference on Scalable Uncertainty Management, SUM 2008, held in Naples, Italy, in Oktober 2008. The 27 revised full papers presented together with the extended abstracts of 3 invited talks/tutorials were carefully reviewed and selected from 42 submissions. The papers address artificial intelligence researchers, database researchers, and practitioners to demonstrate theoretical techniques required to manage the uncertainty that arises in large scale real world applications and to cope with large volumes of uncertainty and inconsistency in databases, the Web, the semantic Web, and artificial intelligence in general.

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.

Current Trends in Database Technology - EDBT 2006

Author : Torsten Grust
Publisher : Springer Science & Business Media
ISBN 13 : 3540467882
Total Pages : 961 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis Current Trends in Database Technology - EDBT 2006 by : Torsten Grust

Download or read book Current Trends in Database Technology - EDBT 2006 written by Torsten Grust and published by Springer Science & Business Media. This book was released on 2006-10-10 with total page 961 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed joint post-proceedings of nine workshops held as part of the 10th International Conference on Extending Database Technology, EDBT 2006, held in Munich, Germany in March 2006. The 70 revised full papers presented were selected from numerous submissions during two rounds of reviewing and revision.