Constraints on Null Values in Relational Databases.

Billie S. Goldstein: Constraints on Null Values in Relational Databases. VLDB 1981: 101-110

@inproceedings{DBLP:conf/vldb/Goldstein81,
  author    = {Billie S. Goldstein},
  title     = {Constraints on Null Values in Relational Databases},
  booktitle = {Very Large Data Bases, 7th International Conference, September
               9-11, 1981, Cannes, France, Proceedings},
  publisher = {IEEE Computer Society},
  year      = {1981},
  pages     = {101-110},
  ee        = {db/conf/vldb/Goldstein81.html},
  crossref  = {DBLP:conf/vldb/81},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

If null values are allowed in a database, the database designer may want to restrict where they occur. Two constructs are presented for specifying where null values may occur in a relational database. Several examples demonstrate the use of these two techniques. The two constructs are shown to be almost equivalent; a criterion for exact equivalence is given. Under the same criterion, interesting special cases of both constructs are also shown to be equivalent.

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Very Large Data Bases, 7th International Conference, September 9-11, 1981, Cannes, France, Proceedings. IEEE Computer Society 1981
Contents

References

[ANSI]: ...
[BBG]: Catriel Beeri, Philip A. Bernstein, Nathan Goodman: A Sophisticate's Introduction to Database Normalization Theory. VLDB 1978: 113-124
[BG]: Philip A. Bernstein, Nathan Goodman: What does Boyce-Codd Normal Form Do? VLDB 1980: 245-259
[Co]: ...
[Go]: ...
[Li]: Y. Edmund Lien: Multivalued Dependencies with Null Values in Relational Data Bases. VLDB 1979: 61-66
[LP]: ...
[Ma]: ...
[Sc]: ...
[St]: ...
[Ul]: Jeffrey D. Ullman: Principles of Database Systems, 1st Edition. Computer Science Press 1980
[Va]: Yannis Vassiliou: Null Values in Data Base Management: A Denotational Semantics Approach. SIGMOD Conference 1979: 162-169
[Wa]: ...
[Za]: ...