91 search results - page 2 / 19 » Aggregate Operators in Constraint Query Languages |
ICDT
1999
ACM
14 years 21 days ago
1999
ACM
Abstract. In this paper we present a new approach for studying aggregations in the context of database query languages. Starting from a broad de nition of aggregate function, we ad...
OTM
2007
Springer
14 years 2 months ago
2007
Springer
We present a pragmatic extension of a Semantic Web query language (including so-called grounded conjunctive queries) with a termination safe functional expression language. This ad...
ICDE
2012
IEEE
11 years 11 months ago
2012
IEEE
— Uncertainties in data arise for a number of reasons: when the data set is incomplete, contains conflicting information or has been deliberately perturbed or coarsened to remov...
CL
1999
Springer
13 years 8 months ago
1999
Springer
Van Emden's incremental queries address the inadequacy of current Prolog-style querying mechanism in most logic programming systems for interactive problem-solving. In the co...
FLOPS
2008
Springer
13 years 10 months ago
2008
Springer
In this paper, we present an extension of the scheme HH(C) (Hereditary Harrop formulas with Constraints) with a suitable formulation of negation in order to obtain a constraint ded...