Database Modeling & Design Fourth Edition- P6 docx

... concepts that can be applied to the conceptual data modeling phase of the database life cycle. In Section 2.1, we will look at the simple level of ER modeling described in the original work by Chen ... all occurrences of that entity depend on an associated (strong) entity for their existence in the database. For example, in Figure 2.1, the weak entity Employee-job-history is related to...

Ngày tải lên: 05/07/2014, 05:20

... resulting table. The two key attributes are taken from the same domain but are given different names to designate their unique use. The one-to-many relationship requires a foreign key in the resulting

Ngày tải lên: 05/07/2014, 05:20

... with MVDs A ->> B and CD ->> EF. The first decomposition of R is into two tables R1(A,B) and R2(A,C,D,E,F) by applying the MVD A ->> B and its complement A->>CDEF. Table ... CD ->> EF and its complement CD ->> A. Both R21 and R22 are now 4NF. If we had applied the MVD complement rule in the opposite order, using CD ->> EF and its complement CD ->&g...

Ngày tải lên: 05/07/2014, 05:20

... growth should be estimated, as each will have significant effect on the later stages of database design. 7.1.1 Design Problems 1. Using the information given and, in particular, the five assertions, derive ... relationship. a. one-to-one-to-one => three overlapping composite keys, at least BCNF b. one-to-one-to-many => two overlapping composite keys, at least BCNF c. one-to-many-t...

Ngày tải lên: 05/07/2014, 05:20

... approaches are used to extract knowledge from a database. First, a user may have a hypothesis to verify or disprove. This type of analysis is done with standard database queries and statistical analysis. The ... experiment with and modify existing algorithms. The major database vendors also offer data mining packages that function with their databases. Due to the large scope of data min...

Ngày tải lên: 05/07/2014, 05:20

... Teorey.book Page iv Saturday, July 16, 2005 12:57 PM

Ngày tải lên: 05/07/2014, 05:20

... Database Modeling & Design: Logical Design Fourth Edition TOBY TEOREY SAM LIGHTSTONE TOM NADEAU AMSTERDAM • BOSTON ... Cerra Publishing Services Manager Simon Crump Editorial Assistant Asma Stephan Cover Design Yvo Riezebos Design Cover Image Getty Images Composition Multiscience Press, Inc. Technical Illustration ... CA 94111 This book is printed on acid-free paper. © 2006...

Ngày tải lên: 05/07/2014, 05:20

... available to help design the most efficient databases. This book is devoted to the logical design methodologies and tools most popular for relational databases today. Physical design methodologies ... Tools for Logical Database Design 187 9.1 Introduction to the CASE Tools 188 9.2 Key Capabilities to Watch For 191 9.3 The Basics 192 9.4 Generating a Database from a Design 196 9....

Ngày tải lên: 05/07/2014, 05:20

... the approach to designing large relational databases by reducing the Teorey.book Page 6 Saturday, July 16, 2005 12:57 PM 1.2 The Database Life Cycle 3 1.2 The Database Life Cycle The database life ... requirements Physical design Logical design Implementation Teorey.book Page 4 Saturday, July 16, 2005 12:57 PM 1.2 The Database Life Cycle 5 b.View integration. Usually, when the d...

Ngày tải lên: 05/07/2014, 05:20

... data modeling and database design techniques is impor- tant for database practitioners and application developers. The database life cycle shows the steps needed in a methodical approach to designing a ... data modeling and logical database design examples throughout this book. In conceptual data modeling, the overriding emphasis is on simplic- ity and readability. The goal o...

Ngày tải lên: 05/07/2014, 05:20