121 search results - page 18 / 25 » On Containment of Conjunctive Queries with Negation |
PR
2002
13 years 7 months ago
2002
In this paper, we present the results of a project that seeks to transform low-level features to a higher level of meaning. This project concerns a technique, latent semantic inde...
CIKM
2008
Springer
13 years 9 months ago
2008
Springer
Opinion retrieval is a document retrieving and ranking process. A relevant document must be relevant to the query and contain opinions toward the query. Opinion polarity classific...
VLDB
2007
ACM
14 years 8 months ago
2007
ACM
Views over probabilistic data contain correlations between tuples, and the current approach is to capture these correlations using explicit lineage. In this paper we propose an al...
PODS
2009
ACM
14 years 8 months ago
2009
ACM
The paper investigates the question of whether a partially closed database has complete information to answer a query. In practice an enterprise often maintains master data Dm, a ...
DBA
2006
13 years 9 months ago
2006
In order to facilitate query processing, the information contained in data warehouses is typically stored as a set of materialized views. Deciding which views to materialize prese...