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ERSHOV
2009
Springer
14 years 2 months ago
2009
Springer
Abstract. We consider the problem of query containment for conjunctive queries with safe negation property. A necessary and sufficient condition for two queries to be in containmen...
VLDB
2007
ACM
14 years 1 months ago
2007
ACM
A relational ranking query uses a scoring function to limit the results of a conventional query to a small number of the most relevant answers. The increasing popularity of this q...
DL
1998
Springer
13 years 11 months ago
1998
Springer
Previous models of dynamic querying supported by query previews have focussed on attribute based querying, have required information providers to create preview tables, and have p...
EUSFLAT
2003
13 years 9 months ago
2003
The traditional query languages used in database management systems require precise and unambiguous queries only. Fuzzy querying were introduced to relax this rigidity and allow t...
DELOS
2000
13 years 9 months ago
2000
We consider a query subscription system that can provide users with information about web changes that interest them. We present a query subscription language and a system that co...