427 search results - page 18 / 86 » Conjunctive Query Answering in EL using a Database System |
ICDT
1995
ACM
14 years 8 days ago
1995
ACM
Partial information in databases can arise when information from several databases is combined. Even if each database is complete for some \world", the combined databases wil...
IS
2007
13 years 8 months ago
2007
Sensors are often employed to monitor continuously changing entities like locations of moving objects and temperature. The sensor readings are reported to a database system, and a...
IV
2002
IEEE
14 years 1 months ago
2002
IEEE
In this paper a visual approach to querying in large spatial databases is presented. A diagrammatic technique utilising a data flow metaphor is used to express different kinds of...
WEBDB
2000
Springer
14 years 9 days ago
2000
Springer
Rewriting queries using views is a powerful technique that has applications in data integration, data warehousing and query optimization. Query rewriting in relational databases i...
KES
2004
Springer
14 years 2 months ago
2004
Springer
When the available information is imperfect, it is often desirable to represent it in the database, so that it can be used to answer queries of interest as much as possible. The da...