character string substitution

2011 ◽  
Keyword(s):  
Character String

Character string pattern matching in Algol 68

1977 ◽  
Vol 12 (6) ◽  
pp. 144-152 ◽  
Author(s):  
R. J.W. Housden ◽  
N. Kotarski
Keyword(s):  
Pattern Matching ◽  
Character String ◽  
String Pattern ◽  
Algol 68

Incomplete information in a relational database

1980 ◽  
Vol 3 (3) ◽  
pp. 363-377
Author(s):  
John Grant
Keyword(s):  
Incomplete Information ◽  
Relational Database ◽  
Functional Dependency ◽  
Relational Algebra ◽  
Database Model ◽  
Character String

In this paper we investigate the inclusion of incomplete information in the relational database model. This is done by allowing nonatomic entries, i.e. sets, as elements in the database. A nonatomic entry is interpreted as a set of possible elements, one of which is the correct one. We deal primarily with numerical entries where an allowed set is an interval, and character string entries. We discuss the various operations of the relational algebra as well as the notion of functional dependency for the database model.

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