373 search results - page 22 / 75 » Querying Priced Information in Databases: The Conjunctive Ca... |
WSMAI
2004
14 years 11 months ago
2004
Continuous Queries (CQ) help users to retrieve results as soon as they become available. The CQ keeps track of two important events. If there is any change in the source informatio...
VLDB
1989
ACM
15 years 1 months ago
1989
ACM
Fuzzy set theory represents a uniform framework for extending the relational database model to han-, dle imprecision of information found in the real world. None of the existing p...
PODS
2005
ACM
15 years 9 months ago
2005
ACM
We investigate the question of whether a query can be answered using a set V of views. We first define the problem in information-theoretic terms: we say that V determines if V pr...
ER
2004
Springer
15 years 3 months ago
2004
Springer
This paper uses a knowledge-based approach to querying heterogeneous spatial databases based on an ontology and conceptual and attribute similarities. The ontology, which may be in...
INFSOF
2007
14 years 9 months ago
2007
A set of mutation operators for SQL queries that retrieve information from a database is developed and tested against a set of queries drawn from the NIST SQL Conformance Test Sui...