383 search results - page 5 / 77 » Query Containment for Conjunctive Queries with Regular Expre... |
DEDUCTIVE
1994
13 years 8 months ago
1994
Given an intensional database (IDB) and an extension database (EDB), the view update problem translates updates on the IDB into updates on the EDB. One approach to the view update...
EDBT
2004
ACM
14 years 7 months ago
2004
ACM
PODS
2006
ACM
14 years 7 months ago
2006
ACM
Privacy-preserving query-answering systems answer queries while provably guaranteeing that sensitive information is kept secret. One very attractive notion of privacy is perfect p...
DBPL
2007
Springer
14 years 1 months ago
2007
Springer
Abstract. The complexity of containment and satisfiability of conjunctive queries over finite, unranked, labeled trees is studied with respect to the axes Child, NextSibling, the...
DEXA
2010
Springer
13 years 7 months ago
2010
Springer
We consider the containment problem for conjunctive queries with atomic negation. Firstly, we refine an existing algorithm based on homomorphism checks, which itself improves other...