E F Codd
Abstract
My earlier paper TRI/EFC-4 from The Relational Institute on this subject was published in ACM SIGMOD Record, December 1986. As a result, I have received several comments and proposed changes. The purpose of this paper is to respond to these items, while continuing to place heavy emphasis on the semantic aspects of missing information. The response is principally further explanation, but a few changes of a quite minor character are proposed. In this paper the reader is assumed to have read TRI/EFC-4.
- [1] "Extending the Database Relational Model to Capture More Meaning", ACM TODS, Vol. 4, No. 4, December 1979. Google Scholar
Digital Library
- TRI/EFC-4 "Missing Information in Relational Databases: Applicable and Inapplicable", February 21, 1986.Google Scholar
- TRI/EFC-6 "The Twelve Rules for Relational DBMS", May 16, 1986.Google Scholar
Index Terms
- More commentary on missing information in relational databases (applicable and inapplicable information)
Recommendations
Missing information (applicable and inapplicable) in relational databases
There has been some technical and justified criticism of the treatment of missing information in the data sublanguage SQL and in IBM's Database 2 system (a relational database management system). Some of this criticism has been directed (by mistake) at ...
Comments