409 search results - page 54 / 82 » Plan Databases: Model and Algebra |
102
Voted
EDBT
2004
ACM
15 years 12 months ago
2004
ACM
The join operation, which combines tuples from multiple relations, is the most fundamental and, typically, the most expensive operation in database queries. The standard approach t...
139
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SDB
1995
15 years 3 months ago
1995
Most of work on partial information in databases asks which operations of standard languages, like relational algebra, can still be performed correctly in the presence of nulls. In...
115
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JUCS
2002
14 years 11 months ago
2002
Abstract: This paper presents a complete system for scheduling transportation orders to a fleet of autonomous mobile robots in service environments. It consists of the autonomous m...
127
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DBPL
1993
Springer
15 years 3 months ago
1993
Springer
In this paper we study the expressive power of query languages for nested bags. We de ne the ambient bag language by generalizing the constructs of the relational language of Brea...
IDEAS
2007
IEEE
15 years 6 months ago
2007
IEEE
We present an extensible and customizable framework for the autonomous discovery of Semantic Web services based on their QoS properties. Using semantic technologies, users can spe...