121 search results - page 4 / 25 » On Containment of Conjunctive Queries with Negation |
DLOG
1997
13 years 9 months ago
1997
TOCL
2008
13 years 7 months ago
2008
PODS
2004
ACM
14 years 7 months ago
2004
ACM
The problem of deciding query containment has important applications in classical query optimization and heterogeneous database systems. Query containment is undecidable for unres...
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
PODS
2000
ACM
14 years 2 days ago
2000
ACM
The problem of query containment is fundamental to many aspects of database systems, including query optimization, determining independence of queries from updates, and rewriting ...