396 search results - page 29 / 80 » Semantic Optimization of Preference Queries |
SIGMOD
2006
ACM
14 years 7 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 ...
WWW
2010
ACM
14 years 2 months ago
2010
ACM
The Semantic Web community, until now, has used traditional database systems for the storage and querying of RDF data. The SPARQL query language also closely follows SQL syntax. A...
VLDB
1991
ACM
13 years 11 months ago
1991
ACM
We explore the implications of supporting bags (i.e. multisets) in a data model and associated query language, and present some formal results concerned with the algebraic propert...
COOPIS
2002
IEEE
14 years 19 days ago
2002
IEEE
This paper addresses several problems associated with the specification of Web searches, and the retrieval, filtering, and rating of Web pages in order to improve the relevance, pr...
SAC
2010
ACM
14 years 2 months ago
2010
ACM
Keyword-based search returns its results without concern for the information needs of users at a particular time. In general, search queries are too short to represent what users ...