710 search results - page 103 / 142 » Relational Expressive Power of Constraint Query Languages |
EDBT
2002
ACM
14 years 7 months ago
2002
ACM
Abstract. This work addresses the problem of querying moving objects databases. which capture the inherent uncertainty associated with the location of moving point objects. We addr...
OOPSLA
2009
Springer
14 years 2 months ago
2009
Springer
Scripting languages enjoy great popularity due their support for rapid and exploratory development. They typically have lightweight syntax, weak data privacy, dynamic typing, powe...
KI
2002
Springer
13 years 7 months ago
2002
Springer
In the previous two decades, a number of qualitative constraint calculi have been developed, which are used to represent and reason about spatial configurations. A common property...
FOCS
1998
IEEE
13 years 12 months ago
1998
IEEE
This paper deals with the evaluation of acyclic Boolean conjunctive queries in relational databases. By well-known results of Yannakakis [1981], this problem is solvable in polynom...
PODS
2010
ACM
13 years 8 months ago
2010
ACM
We study functional and multivalued dependencies over SQL tables with NOT NULL constraints. Under a no-information interpretation of null values we develop tools for reasoning. We...