8 search results - page 1 / 2 » Symmetric Relations and Cardinality-Bounded Multisets in Dat... |
VLDB
2004
ACM
13 years 11 months ago
2004
ACM
In a binary symmetric relationship, A is related to B if and only if B is related to A. Symmetric relationships between k participating entities can be represented as multisets of...
ICDE
1994
IEEE
13 years 10 months ago
1994
IEEE
The relational data model is based on sets of tuples, i.e. it does not allow duplicate tuples in a relation. Many database languages and systems do require multi-set place, the hi...
SIGMOD
1996
ACM
13 years 10 months ago
1996
ACM
Magic sets rewriting is a well-known optimization heuristic for complex decision-support queries. There can be many variants of this rewriting even for a single query, which diffe...
DASFAA
2007
IEEE
13 years 10 months ago
2007
IEEE
Abstract. OWL is a recommended language for publishing and sharing ontologies on the Semantic Web. To manage the ontologies, several OWL data management systems have been proposed....
PODS
2006
ACM
14 years 6 months ago
2006
ACM
Query containment is a fundamental algorithmic problem in database query processing and optimization. Under set semantics, the query-containment problem for conjunctive queries ha...