TAILIEUCHUNG - Database Systems - Part 3 & 4

A data model is an integrated collection of concepts for describing and manipulating data, relationships between data, and constraints on the data in an organization. • A model is a representation of “real world” objects and events, and their associations. It is an abstraction that concentrates on the essential, inherent aspects of an organization and ignores accidental properties. • A data model must provide the basic concepts and notations that will allow database designers and end-users unambiguously and accurately to communicate their understanding of the organizational data | COP 4710: Database Systems Spring 2004 Introduction to Data Modeling BÀI 3&4, 2 ngày School of Electrical Engineering and Computer Science University of Central Florida Instructor : Mark Llewellyn markl@ CC1 211, 823-2790 Phd, MS, Under A data model is an integrated collection of concepts for describing and manipulating data, relationships between data, and constraints on the data in an organization. A model is a representation of “real world” objects and events, and their associations. It is an abstraction that concentrates on the essential, inherent aspects of an organization and ignores accidental properties. A data model must provide the basic concepts and notations that will allow database designers and end-users unambiguously and accurately to communicate their understanding of the organizational data. Data Models A data model can be thought of as comprising three components: A structural part, consisting of a set of rules

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