Database Repairing and Consistent Query Answering
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Database Repairing and Consistent Query Answering

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eBook - PDF

Database Repairing and Consistent Query Answering

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About This Book

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

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Yes, you can access Database Repairing and Consistent Query Answering by Leopoldo Bertossi in PDF and/or ePUB format, as well as other popular books in Informatique & Réseaux informatiques. We have over one million books available in our catalogue for you to explore.

Information

Publisher
Springer
Year
2022
ISBN
9783031018831
Topic
Informatique
Subtopic
Réseaux informatiques

Table of contents

  1. Cover
  2. Copyright Page
  3. Title Page
  4. Contents
  5. Preface
  6. Acknowledgments
  7. Introduction
  8. The Notions of Repair and Consistent Answer
  9. Tractable CQA and Query Rewriting
  10. Logically Specifying Repairs
  11. Decision Problems in CQA: Complexity and Algorithms
  12. Repairs and Data Cleaning
  13. Bibliography
  14. Author's Biography