35 search results - page 1 / 7 » Containment of Conjunctive Queries over Conceptual Schemata |
DASFAA
2006
IEEE
13 years 11 months ago
2006
IEEE
ICDT
2007
ACM
13 years 11 months ago
2007
ACM
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
DBPL
2007
Springer
13 years 11 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...
EDBT
2002
ACM
14 years 4 months ago
2002
ACM
The problem of finding contained rewritings of queries using views is of great importance in mediated data integration systems. In this paper, we first present a general approach f...
SEBD
2007
13 years 6 months ago
2007
We consider the problem of query containment over an object data model derived from F-logic. F-logic has generated considerable interest commercially, in the academia, and within ...