Relational algebra

Known as: Natural join, Relational logic, Relational 
Relational algebra, first created by E.F. Codd while at IBM, is a family of algebras with a well-founded semantics used for modelling the data stored… (More)
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Highly Cited
2005
Highly Cited
2005
The SPARQL query language for RDF provides Semantic Web developers with a powerful tool to extract information from large… (More)
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Highly Cited
2005
Highly Cited
2005
This paper introduces RankSQL, a system that provides a systematic and principled framework to support efficient evaluations of… (More)
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Highly Cited
2003
Highly Cited
2003
The handling of user preferences is becoming an increasingly important issue in present-day information systems. Among others… (More)
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Highly Cited
1998
Highly Cited
1998
A software architecture is typicall y drawn as a nested set of box and arrow diagrams. The boxes represent components of the… (More)
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Highly Cited
1997
Highly Cited
1997
We present a probabilistic relational algebra (PRA) which is a generalization of standard relational algebra. In PRA, tuples are… (More)
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Highly Cited
1988
Highly Cited
1988
Present database systems process all the data related to a query before giving out responses. As a result, the size of the data… (More)
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Highly Cited
1984
Highly Cited
1984
This paper present algorithms for relational algebra and set operations based on hashing. Execution times are computed and… (More)
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Highly Cited
1982
Highly Cited
1982
Aggregate functtons m relattonal query languages allow intricate reports to be written. In this paper aggregate functions are… (More)
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Highly Cited
1975
Highly Cited
1975
An approach for implementing a “smart” interface to support a relational view of data is proposed. The basic idea is to employ… (More)
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Highly Cited
1972
Highly Cited
1972
In the near future, we can expect a great variety of languages to be proposed for interrogating and updating data bases. This… (More)
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