710 search results - page 28 / 142 » Relational Expressive Power of Constraint Query Languages |
DBPL
1999
Springer
13 years 12 months ago
1999
Springer
Linear constraint databases and query languages are appropriate for spatial database applications. Not only the data model is natural to represent a large portion of spatial data s...
EDBT
2000
ACM
13 years 11 months ago
2000
ACM
the research activities. This abstract is to introduce the approach of a data model - EP data model. Its data structure is able to store as a finite set of nodes arbitrary effectiv...
ICDT
2010
ACM
14 years 5 months ago
2010
ACM
It is known that the composition of schema mappings, each specified by source-to-target tgds (st-tgds), can be specified by a secondorder tgd (SO tgd). We consider the question of...
PODS
2000
ACM
14 years 1 days ago
2000
ACM
We consider spatial databases in the plane that can be defined by polynomial constraint formulas. Motivated by applications in geographic information systems, we investigate line...
PODS
2006
ACM
14 years 7 months ago
2006
ACM
We propose a novel approach to the classical view update problem. The view update problem arises from the fact that modifications to a database view may not correspond uniquely to...