141 search results - page 3 / 29 » Equivalence of queries combining set and bag-set semantics |
PEPM
2010
ACM
14 years 3 months ago
2010
ACM
We show how to efficiently evaluate generic map-filter-product queries, generalizations of select-project-join (SPJ) queries in relational algebra, based on a combination of two...
ICMCS
2006
IEEE
14 years 9 days ago
2006
IEEE
In order to solve medical multimodal queries, we propose to split the queries in different dimensions using ontology. We extract both textual and visual terms depending on the ont...
ICDT
2009
ACM
14 years 7 months ago
2009
ACM
We study containment and equivalence of (unions of) conjunctive queries on relations annotated with elements of a commutative semiring. Such relations and the semantics of positiv...
SIGMOD
2006
ACM
14 years 6 months ago
2006
ACM
We study the problem of finding efficient equivalent viewbased rewritings of relational queries, focusing on query optimization using materialized views under the assumption that ...
WISE
2010
Springer
13 years 4 months ago
2010
Springer
Abstract. Regarding web searches, users have become used to keywordbased search interfaces due to their ease of use. However, this implies a semantic gap between the user's in...