Database Modeling & Design Fourth Edition- P29 potx

... R5: DFJ (F->DJ with key F) R2: AEF (A->EF with key A) R6: DKLMNP (D->KLMNP, L->D, with keys D, L) R3: EG (E->G with key E) R7: PQRT (PQR->T with key PQR) R4: DGI (G->DI with ... Projections skill_required emp_id proj_no skill_type MVDs(nontrivial) 101 3 A proj_no ->> skill_type 101 3 B proj_no ->> emp_id 101 4 A 101 4 C 102 3 A 102 3 B 103 5 D skill_req1 skil...

Ngày tải lên: 05/07/2014, 05:20

... by a DBMS. database life cycle—An enumeration and definition of the basic steps in the requirements analysis, design, creation, and maintenance of a database as it evolves over time. database management ... query. fourth normal form (4NF)—A table is in fourth normal form (4NF) if and only if it is at least in BCNF and if whenever there exists a nontrivial multivalued dependency of...

Ngày tải lên: 05/07/2014, 05:20

... 109 constraints, 217 UML constructs, 42 QDesigner, 190 Query optimization, 177–78 Rational Data Architect, 188, 189, 211 automatic computing linkages, 198 ER modeling, 193 property editing, 195 XML ... 69 techniques, 69 type conflict, 71 Views, 166 coordinates of, 178 creating, 229 dynamic selection, 176 ER modeling based on requirements, 61–63 exponential explosion, 167–69 size estimatio...

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

... 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

... shown here. (a) Figure 2.3 Conceptual data modeling notations ER model constructs using the Chen notation ER model constructs using the "crow's-foot” approach [Knowledgeware] Department Division ... applied to Department to designate the start date for that department. Alternatively, it could be applied to Employee as an attribute for each Employee instance, to designate the em...

Ngày tải lên: 05/07/2014, 05:20