Hugh Darwen – författare

Temporal database systems are systems that provide special support for storing, querying, and updating historical and/or future data. Current DBMSs provide essentially no temporal features at all, but this situation is likely to change soon for a variety of reasons; in fact, temporal databases are virtually certain to become important sooner rather than later, in the commercial world as well as in academia. This book provides an in-depth description of the foundations and principles on which those temporal DBMSs will be built. These foundations and principles are firmly rooted in the relational model of data; thus, they represent an evolutionary step, not a revolutionary one, and they will stand the test of time.This book is arranged in three parts and a set of appendixes:* Preliminaries: Provides a detailed review of the relational model, and an overview of the Tutorial D language.* Laying the Foundations: Explains basic temporal data problems and introduces fundamental constructs and operators for addressing those problems.* Building on the Foundations: Applies the material of the previous part to issues of temporal database design, temporal constraints, temporal query and update, and much more.* Appendixes: Include annotated references and bibliography, implementation considerations, and other topics.Key features:* Describes a truly relational approach to the temporal data problem.* Addresses implementation as well as model issues.* Covers recent research on new database design techniques, a new normal form, new relational operators, new update operators, a new approach to the problem of "granularity," support for "cyclic point types," and other matters.* Includes review questions and exercises in every chapter.* Suitable for both reference and tutorial purposes.

Time and Relational Theory provides an in-depth description of temporal database systems, which provide special facilities for storing, querying, and updating historical and future data. Traditionally, database management systems provide little or no special support for temporal data at all. This situation is changing because:

Cheap storage enables retention of large volumes of historical data in data warehouses Users are now faced with temporal data problems, and need solutions Temporal features have recently been incorporated into the SQL standard, and vendors have begun to add temporal support to their DBMS products

Based on the groundbreaking text Temporal Data & the Relational Model (Morgan Kaufmann, 2002) and new research led by the authors, Time and Relational Theory is the only book to offer a complete overview of the functionality of a temporal DBMS. Expert authors Nikos Lorentzos, Hugh Darwen, and Chris Date describe an approach to temporal database management that is firmly rooted in classical relational theory and will stand the test of time.

This book covers the SQL:2011 temporal extensions in depth and identifies and discusses the temporal functionality still missing from SQL.

Understand how the relational model provides an ideal basis for taming the complexities of temporal databases Learn how to analyze and evaluate commercial temporal products with this timely and important information Be able to use sound principles in designing and using temporal databases Understand the temporal support recently added to SQL with coverage of the new SQL features in this unique, accurate, and authoritative reference Appreciate the benefits of a truly relational approach to the problem with this clear, user friendly presentation

Time and Relational Theory provides an in-depth description of temporal database systems, which provide special facilities for storing, querying, and updating historical and future data. Traditionally, database management systems provide little or no special support for temporal data at all. This situation is changing because:- Cheap storage enables retention of large volumes of historical data in data warehouses- Users are now faced with temporal data problems, and need solutions- Temporal features have recently been incorporated into the SQL standard, and vendors have begun to add temporal support to their DBMS productsBased on the groundbreaking text Temporal Data & the Relational Model (Morgan Kaufmann, 2002) and new research led by the authors, Time and Relational Theory is the only book to offer a complete overview of the functionality of a temporal DBMS. Expert authors Nikos Lorentzos, Hugh Darwen, and Chris Date describe an approach to temporal database management that is firmly rooted in classical relational theory and will stand the test of time.This book covers the SQL:2011 temporal extensions in depth and identifies and discusses the temporal functionality still missing from SQL.- Understand how the relational model provides an ideal basis for taming the complexities of temporal databases- Learn how to analyze and evaluate commercial temporal products with this timely and important information- Be able to use sound principles in designing and using temporal databases- Understand the temporal support recently added to SQL with coverage of the new SQL features in this unique, accurate, and authoritative reference- Appreciate the benefits of a truly relational approach to the problem with this clear, user friendly presentation