Comparison of four relational data model specifications

Authors:
Winfried Lamersdorf
Affiliations:
Universität Hamburg, Fachbereich Informatik, Hamburg, West-Germany
Venue:
ACM SIGMOD Record
Year:
1983

Citing 3
Cited 0

A formal definition of the relational model

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A precise definition of basic relational notions and of the relational algebra

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Final report of the ANSI/X3/SPARC DBS-SG relational database task group

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Abstract

This paper reviews four different approaches to specifying the relational data model which are written at about the same time:1. the 'Definition and Formalization of the Relational Data Model' as provided as part of the final ANSI/X3/SPARC/DBSSG Relational Database Task Group Report,2. the 'Relational Database Model Specifications' as submitted to the National Bureau of Standards by the Computer Corporation of America as a draft report in October 1981,3. the 'Formal Definition of the Relational Model' as specified by C. Date of IBM, San Jose, and4. the specification of the relational data model which is expressed in terms of the 'Positional Set Notation' as given in the 'Abstract Database Model' project of the National Bureau of Standards in October 1981.The paper points out some of the differences between the four approaches to specifying the RDM semantics.