685 search results - page 69 / 137 » Personalized Queries under a Generalized Preference Model |
PVLDB
2010
13 years 6 months ago
2010
Ontology-based data access is a powerful form of extending database technology, where a classical extensional database (EDB) is enhanced by an ontology that generates new intensio...
DBPL
1993
Springer
13 years 12 months ago
1993
Springer
In this paper we study the expressive power of query languages for nested bags. We de ne the ambient bag language by generalizing the constructs of the relational language of Brea...
SIGMOD
2012
ACM
11 years 10 months ago
2012
ACM
The popularity of mobile social networking services (mSNSs) is propelling more and more businesses, especially those in retailing and marketing, into mobile and location-based for...
SDB
1995
13 years 11 months ago
1995
Most of work on partial information in databases asks which operations of standard languages, like relational algebra, can still be performed correctly in the presence of nulls. In...
DAGSTUHL
2007
13 years 9 months ago
2007
Local tag structures have become frequent through Web 2.0: Users "tag" their data without specifying the underlying semantics. Every user annotates items in an individual...