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The entity-relationship model—toward a unified view of data

The entity-relationship model—toward a unified view of data The Entity-Relationship Unified View of Data PETER PIN-SHAN Massachusetts CHEN Model-Toward a Institute of Technology A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for database design. An example of database design and description using the model and the diagrammatic technique is given. Some implications for data integrity, information retrieval, and data manipulation are discussed. The entity-relationship model can be used as a basis for unification of different views of data: t,he network model, the relational model, and the entity set model. Semantic ambiguities in these models are analyzed. Possible ways to derive their views of data from the entity-relationship model are presented. Key Words and Phrases: database design, logical view of data, semantics of data, data models, entity-relationship model, relational model, Data Base Task Group, network model, entity set model, data definition and manipulation, data integrity and consistency CR Categories: 3.50, 3.70, 4.33, 4.34 1. INTRODUCTION The logical view of data has been an important issue in recent years. Three major data models have been proposed: the network model [2, 3, 71, the relational model http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ACM Transactions on Database Systems (TODS) Association for Computing Machinery

The entity-relationship model—toward a unified view of data

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References (13)

Publisher
Association for Computing Machinery
Copyright
Copyright © 1976 by ACM Inc.
ISSN
0362-5915
DOI
10.1145/320434.320440
Publisher site
See Article on Publisher Site

Abstract

The Entity-Relationship Unified View of Data PETER PIN-SHAN Massachusetts CHEN Model-Toward a Institute of Technology A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for database design. An example of database design and description using the model and the diagrammatic technique is given. Some implications for data integrity, information retrieval, and data manipulation are discussed. The entity-relationship model can be used as a basis for unification of different views of data: t,he network model, the relational model, and the entity set model. Semantic ambiguities in these models are analyzed. Possible ways to derive their views of data from the entity-relationship model are presented. Key Words and Phrases: database design, logical view of data, semantics of data, data models, entity-relationship model, relational model, Data Base Task Group, network model, entity set model, data definition and manipulation, data integrity and consistency CR Categories: 3.50, 3.70, 4.33, 4.34 1. INTRODUCTION The logical view of data has been an important issue in recent years. Three major data models have been proposed: the network model [2, 3, 71, the relational model

Journal

ACM Transactions on Database Systems (TODS)Association for Computing Machinery

Published: Mar 1, 1976

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