221 search results - page 10 / 45 » Chase of Recursive Queries |
ICDT
2005
ACM
14 years 29 days ago
2005
ACM
We study the problem of rewriting queries using views in the presence of access patterns, integrity constraints, disjunction, and negation. We provide asymptotically optimal algori...
ICDE
2007
IEEE
14 years 8 months ago
2007
IEEE
We study the problem of answering queries posed on virtual views of XML documents, a problem commonly encountered when enforcing XML access control and integrating data. We approa...
ICDE
1991
IEEE
13 years 11 months ago
1991
IEEE
— Constraints play an important role in the efficient query evaluation in deductive databases. In this paper, constraint-based query evaluation in deductive databases is investi...
IJCAI
1997
13 years 8 months ago
1997
Generating query-answering plans for information gathering agents requires to translate a user query, formulated in terms of a set of virtual relations, to a query that uses relat...
ALT
2010
Springer
13 years 7 months ago
2010
Springer
This paper is concerned with the combinatorial structure of concept classes that can be learned from a small number of examples. We show that the recently introduced notion of recu...