'Object based data models' diaporamas de présentation

Web-Enabled Decision Support Systems

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Chapter 2

Chapter 2. Database Environment. Objectives. Purpose of three-level database architecture. Contents of external, conceptual, and internal levels. Purpose of external/conceptual and conceptual/internal mappings. Meaning of logical and physical data independence.

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Introduction of DB

Introduction of DB. Database System Concepts and Architecture. Data Models. Data Model : A set of concepts to describe the structure of a database, and certain constraints that the database should obey. Categories of data models.

638 views • 36 slides

Chapter 2

Chapter 2. Database System Concepts and Architecture. Data Models. Data Model : A set of concepts to describe the structure of a database, and certain constraints that the database should obey. Categories of data models.

362 views • 36 slides