19 search results - page 1 / 4 » An optimization of disjunctive queries: union-pushdown |
KRDB
2003
13 years 8 months ago
2003
Motivated by the possibilities of applying deductive database technology for efficient query answering in description logics, we present a translation operator µ that transforms...
PODS
2003
ACM
14 years 7 months ago
2003
ACM
In this paper we study the following problem. Given a database and a set of queries, we want to find, in advance, a set of views that can compute the answers to the queries, such ...
COMPSAC
1997
IEEE
13 years 11 months ago
1997
IEEE
ICDE
2007
IEEE
14 years 8 months ago
2007
IEEE
Optimizing nested queries is an intricate problem. It becomes even harder if in a nested query the linking predicate or the correlation predicate occurs disjunctively. We present ...
ICLP
2010
Springer
13 years 11 months ago
2010
Springer
Abstract. Answer set programming (ASP) is a powerful formalism for knowledge representation and common sense reasoning that allows disjunction in rule heads and nonmonotonic negati...