62 search results - page 3 / 13 » Query rewriting with symmetric constraints |
SIGECOM
2008
ACM
13 years 5 months ago
2008
ACM
We consider the problem of query rewrites in the context of keyword advertisement. Given a three-layer graph consisting of queries, query rewrites, and the corresponding ads that ...
GEOS
2009
Springer
13 years 10 months ago
2009
Springer
Abstract. Often the information present in a spatial knowledge base is represented at a different level of granularity and abstraction than the query constraints. For querying onto...
VLDB
2007
ACM
14 years 5 months ago
2007
ACM
The performance of XML database queries can be greatly enhanced by rewriting them using materialized views. We study the problem of rewriting a query using materialized views, whe...
KES
2007
Springer
13 years 11 months ago
2007
Springer
Abstract. Access control for semi-structured data is nontrivial, as witnessed by the number of access control approaches in recent literature. Recently a case has been made for exp...
ICDT
2005
ACM
13 years 10 months ago
2005
ACM
We consider the problem of retrieving consistent answers over databases that might be inconsistent with respect to some given integrity constraints. In particular, we concentrate o...