147 search results - page 1 / 30 » A Semantics-based Approach to Design of Query Languages 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...
CIKM
1994
Springer
13 years 11 months ago
1994
Springer
The rapid advances in computer and communication technologies, and their merger, is leading to a global information market place. It will consist of federations of very large numb...
EKAW
2008
Springer
13 years 9 months ago
2008
Springer
Query formulation is a key aspect of information retrieval, contributing to both the efficiency and usability of many semantic applications. A number of query languages, such as SP...
CIKM
2008
Springer
13 years 9 months ago
2008
Springer
Query processing techniques for XML data have focused mainly on tree-pattern queries (TPQs). However, the need for querying XML data sources whose structure is very complex or not...
PODS
2009
ACM
14 years 8 months ago
2009
ACM
The paper investigates the question of whether a partially closed database has complete information to answer a query. In practice an enterprise often maintains master data Dm, a ...