Modelling summary data

1 January 1981

proceedings article
Published by Association for Computing Machinery (ACM)

p. 93-97
https://doi.org/10.1145/582318.582333

Abstract

Several problems in specifying aggregate functions in relational systems are investigated. We propose a solution to these problems in the form of an extension of the relational data model. In particular we introduce the concept of summary data. The query language STRAND is presented in order to describe retrieval operations on the extended model. STRAND allows a user to formulate queries involving aggregate functions without conceptualizing the query in terms of aggregation. Two example applications, proposal tracking and socio-demographic data bases, are used to illustrate the concepts of the extended model.

Keywords

RELATIONAL SYSTEM
EXTENDED MODEL
QUERY LANGUAGE
RELATIONAL DATA MODEL
EXAMPLE APPLICATION
SUMMARY DATA
SOCIO-DEMOGRAPHIC DATA BASE
AGGREGATE FUNCTION
MODELLING SUMMARY DATA
PROPOSAL TRACKING
RETRIEVAL OPERATION
INFORMATION RETRIEVAL

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