authoritative resource for readers interested in gaining insight into and understanding of the principles of database systems. This exciting revision continues to provide a solid grounding in the foundations of database technology and to provide some ideas as to how the field is likely to develop in the future. The material is organized into six major parts. Part I provides a broad introduction to the concepts of database systems in general and relational systems in particular. Part II consists of a careful description of the relational model, which is the theoretical foundation for the database field as a whole. Part III discusses the general theory of database design. Part IV is concerned with transaction management. Part V shows how relational concepts are relevant to a variety of further aspects of database technologyPsecurity, distributed databases, temporal data, decision support, and so on. Finally, Part VI describes the impact of object technology on database systems. This Seventh Edition of An Introduction to Database Systems features widely rewritten material to improve and amplify treatment of several topics, including: *Revised and expanded material on the relational mo
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XML: Designing XML internet applications
由于各部分自由度不相等,因此各部分离差平方和不能比较,必须将各部分离差平方和除以相应自由度,其即比值称为均方差,简称为均方。组间均方: ,组内均方:。这时根据这两个值可以进行F检验,即: }gs}image81-5.jpg}/gs} ,表示各个样本不是来自同一总体, ...
Tackle the toughest set-based querying and query tuning problems--guided by an author team with in-depth, inside knowledge of T-SQL. Deepen your understanding of architecture and internals--and gain practical approaches and...
Get a detailed look at the internal architecture of T-SQL with this comprehensive programming reference. Database developers and administrators get best practices, expert techniques, and code samples to master the...
Second Editionnow available! World Wide Web (WWW) sites have been blossoming at an astounding rate, with good reason; WWW technology has proven extraordinarily effective at creating a flexible, interactive, and...
This book provides a practical and proven approach to designing relational databases. It contains two complementary design methodologies: logical data modeling and relational database design. The design methodologies are independent...
Relational databases have quickly come to be regarded as a natural and efficient way of organizing information. Duplicate data can be eliminated and powerful set-theoretic operations can be used to...
The first and only database primer for today's global economy Today's businesses depend on their databases to provide information essential for their day-to-day operations and to help them take advantage...
Coverage of business database systems is organized around the database development life cycle in this text, providing a basis for discussing conceptual and implementation design, database implementation, and the management...