383 search results - page 20 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
SIGMOD
2006
ACM
14 years 8 months ago
2006
ACM
We study the problem of finding efficient equivalent viewbased rewritings of relational queries, focusing on query optimization using materialized views under the assumption that ...
ADBIS
2009
Springer
13 years 6 months ago
2009
Springer
We consider the problem of selecting views and indexes that minimize the evaluation costs of the important queries under an upper bound on the disk space available for storing the ...
HIS
2009
13 years 6 months ago
2009
Recent years have witnessed the wide recognition of the importance of ontology and rule in the AI research. In this paper, we report our implementation and evaluation of a rule-ba...
FCT
2001
Springer
14 years 1 months ago
2001
Springer
This paper presents the prediction-preserving reducibility with membership queries (pwm-reducibility) on formal languages, in particular, simple CFGs and finite unions of regular ...
SEMWEB
2009
Springer
14 years 3 months ago
2009
Springer
An important application of semantic web technology is recognizing human-defined concepts in text. Query transformation is a strategy often used in search engines to derive querie...