861 search results - page 6 / 173 » Relational Completeness of Query Languages for Annotated Dat... |
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
We study containment and equivalence of (unions of) conjunctive queries on relations annotated with elements of a commutative semiring. Such relations and the semantics of positiv...
ICGI
2004
Springer
14 years 22 days ago
2004
Springer
Abstract. A base problem in Web information extraction is to find appropriate queries for informative nodes in trees. We propose to learn queries for nodes in trees automatically ...
AVI
1998
13 years 8 months ago
1998
In this paper we describe VisTool, a prototype tool for querying relational databases by means of the visual query language VISIONARY.
CORR
2011
Springer
13 years 2 months ago
2011
Springer
We study in this paper provenance information for queries with aggregation. Provenance information was studied in the context of various query languages that do not allow for aggr...
CORR
2011
Springer
12 years 11 months ago
2011
Springer
The annotation of the results of database transformations was shown to be very effective for various applications. Until recently, most works in this context focused on positive q...