A relational database model and algebra integrating fuzzy attributes and probabilistic tuples

2021 ◽  
Author(s):  
T.H. Cao
Keyword(s):  
Relational Database ◽  
Database Model ◽  
And Algebra

scholarly journals A probabilistic relational database model and algebra

2015 ◽  
Vol 31 (4) ◽  
pp. 305
Author(s):  
Hoa Nguyen
Keyword(s):  
Relational Database ◽  
Functional Dependency ◽  
Uncertain Information ◽  
Database Model ◽  
Algebraic Operations ◽  
And Algebra ◽  
Attribute Value

This paper introduces a probabilistic relational database model, called PRDB, for representing and querying uncertain information of objects in practice. To develop the PRDB model, first, we represent the relational attribute value as a pair of probabilistic distributions on a set for modeling the possibility that the attribute can take one of the values of the set with a probability belonging to the interval which is inferred from the pair of probabilistic distributions. Next, on the basis representing such attribute values, we formally define the notions as the schema, relation, probabilistic functional dependency and probabilistic relational algebraic operations for PRDB. In addition, a set of the properties of the probabilistic relational algebraic operations in PRDB also are formulated and proven.

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.

Research Background

2013 ◽  
pp. 187-200
Author(s):  
Ibrahim Dweib ◽  
Joan Lu
Keyword(s):  
Data Storage ◽  
Relational Database ◽  
Query Languages ◽  
Xml Schema ◽  
Application Program Interface ◽  
Database Model ◽  
Xml Documents ◽  
Similarities And Differences ◽  
Schema Languages ◽  
Program Interface

In this chapter, the research background is discussed. This includes XML model, XML query languages, XML schema languages, XML Application Program Interface, XML documents types, XML data storage approaches, relational database model, and the similarities and differences between XML model and relational database model. Finally the chapter summary is given.

The relational database model

1990 ◽  
pp. 155-165 ◽  
Author(s):  
Elizabeth Lynch
Keyword(s):  
Relational Database ◽  
Database Model
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