189 search results - page 4 / 38 » Approximating predicates and expressive queries on probabili... |
COOPIS
2004
IEEE
14 years 9 days ago
2004
IEEE
Querying and integrating sources of structured data from the Web in most cases requires similarity-based concepts to deal with data level conflicts. This is due to the often errone...
PPDP
2010
Springer
13 years 7 months ago
2010
Springer
Database query optimizers rely on data statistics in selecting query execution plans. Similar query optimization techniques are desirable for deductive databases and, to make this...
SIGMOD
2008
ACM
14 years 8 months ago
2008
ACM
This article proposes a core query algebra for probabilistic databases. In essence, this core is part of the query languages of most probabilistic database systems proposed so far...
PODS
2004
ACM
14 years 8 months ago
2004
ACM
The problem of deciding query containment has important applications in classical query optimization and heterogeneous database systems. Query containment is undecidable for unres...
PODS
1999
ACM
14 years 26 days ago
1999
ACM
We investigate the problem of how to extend constraint query languages with aggregate operators. We deal with standard relational aggregation, and also with aggregates speci c to ...