710 search results - page 8 / 142 » Relational Expressive Power of Constraint Query Languages |
PODS
1999
ACM
13 years 12 months ago
1999
ACM
We investigate the problem of how to extend constraint query languages with aggregate operators. We deal with standard relational aggregation, and also with aggregates speci c to ...
ACTA
2002
13 years 7 months ago
2002
In the constraint database community, FO+poly and FO+linear have been proposed as foundations for spatial database query languages. One of the strengths of this approach is that t...
LATIN
2004
Springer
14 years 1 months ago
2004
Springer
Abstract. We present a probability logic (essentially a first order language extended with quantifiers that count the fraction of elements in a model that satisfy a first order ...
ICADL
2005
Springer
14 years 1 months ago
2005
Springer
Search engines of main-stream literature digital libraries such as ACM Digital Library, Google Scholar, and PubMed employ file-based systems, and provide users with a basic boolean...
GVD
2009
13 years 5 months ago
2009
Evaluating a traditional database query against a data tuple returns a true on match and a false on mismatch. Unfortunately, there are many application scenarios where such an eva...