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Author Gessert, G. H.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Computer programming, programs & data
Abstract This paper proposes a specific four-valued logic (4VL) as a means of handling missing data in Relational Data Base Management systems. The proposed 4VL is a minor variant of the standard 4VL in which the “least true” condition is interpreted as “inapplicable” rather than “false”. The use of this 4VL is defended on the grounds that by defining several additional unary operators, the 4VL can be rendered intuitively manageable. The proposed unary operators contribute to the conceptual utility of the 4VL by providing an explicit way for users to relate familiar results of two-valued logic to analogous results in 4VL.
Description Affiliation: Director, Corporate MIS, Primerica Corporation, 300 St. Paul Place, Baltimore, MD (Gessert, G. H.)
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1999-06-01
Publisher Place New York
Journal ACM SIGMOD Record (SGMD)
Volume Number 19
Issue Number 1
Page Count 7
Starting Page 29
Ending Page 35


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Source: ACM Digital Library