This book introduces Logical Data Structures (LDS), a powerful new approach to database design that can dramatically improve the cost-effectiveness and business value of any enterprise database system or database-driven application. The authors introduce a new notation, new diagramming approach, and new user-centered, high-ROI techniques for modeling even the most complex, high-volume database applications. This book starts from first principles, asking and answering crucial questions like: "To best serve users, how should the process of data modeling work? To create good, economical software systems, what kind of information should be on a data model? To become an effective data modeler, what skills should you master before talking with users?" Next, it teaches data modeling using LDS, designed to encourage a user-centered, requirements approach that leads directly to more effective applications. The authors walk you through the entire process of creating and enhancing a data model. For all database administrators, analysts, designers, and architects, and for all IT managers responsible for enterprise database system management or deployment.
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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...