Answering queries using views
著者
書誌事項
Answering queries using views
（Synthesis lectures on data management, #54）
Morgan & Claypool, c2019
2nd ed
- : pbk
- : hard
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注記
Includes bibliographical references (p. 237-253)
DOI:10.2200/S00884ED2V01Y201811DTM054
内容説明・目次
内容説明
The topic of using views to answer queries has been popular for a few decades now, as it cuts across domains such as query optimization, information integration, data warehousing, website design and, recently, database-as-a-service and data placement in cloud systems.
This book assembles foundational work on answering queries using views in a self-contained manner, with an effort to choose material that constitutes the backbone of the research. It presents efficient algorithms and covers the following problems: query containment; rewriting queries using views in various logical languages; equivalent rewritings and maximally contained rewritings; and computing certain answers in the data-integration and data-exchange settings. Query languages that are considered are fragments of SQL, in particular select-project-join queries, also called conjunctive queries (with or without arithmetic comparisons or negation), and aggregate SQL queries.
This second edition includes two new chapters that refer to tree-like data and respective query languages. Chapter 8 presents the data model for XML documents and the XPath query language, and Chapter 9 provides a theoretical presentation of tree-like data model and query language where the tuples of a relation share a tree-structured schema for that relation and the query language is a dialect of SQL with evaluation techniques appropriately modified to fit the richer schema.
目次
Preface to the First Edition
Preface to the Second Edition
Acknowledgments
Queries and Views
Query Containment and Equivalence
Finding Equivalent Rewritings
Maximally Contained Rewritings (MCRs)
Answering Queries in Presence of Dependencies
Answering Queries in Data Exchange
Answering Queries Using Views
XPath Queries and Views
Tree-Structured Records Queried with SQL Dialect
Bibliographical Notes for Chapters 1-7
Conclusion for Chapters 1-7
Bibliography
Authors' Biographies
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