1238 search results - page 5 / 248 » View-based query containment |
PODS
2007
ACM
15 years 9 months ago
2007
ACM
Query containment has been studied extensively for fragments of
ICDT
2007
ACM
15 years 3 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...
SEBD
2007
14 years 11 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 ...
SIGMOD
2004
ACM
15 years 9 months ago
2004
ACM
ADBIS
2009
Springer
15 years 4 months ago
2009
Springer
Abstract. We consider the problem of query containment for conjunctive queries with the safe negation property. Some necessary conditions for this problem are given. A part of the ...