5221 search results - page 50 / 1045 » An On-line Problem Database |
ICDT
2005
ACM
14 years 2 months ago
2005
ACM
Abstract. A classical problem in query optimization is to find the optimal ordering of a set of possibly correlated selections. We provide an ion of this problem as a generalizati...
PODS
2010
ACM
14 years 2 months ago
2010
ACM
We give the first optimal algorithm for estimating the number of distinct elements in a data stream, closing a long line of theoretical research on this problem begun by Flajolet...
SDB
1995
14 years 17 days ago
1995
Database transformations arise in many di erent settings including database integration, evolution of database systems, and implementing user views and data-entry tools. This paper...
DPD
1998
13 years 8 months ago
1998
To meet users’ growing needs for accessing pre-existing heterogeneous databases, a multidatabase system (MDBS) integrating multiple databases has attracted many researchers recen...
CIKM
2008
Springer
13 years 11 months ago
2008
Springer
This demonstration presents the concepts, design, and implementation of SCDE, a relational database systems extended with the ability to solve constraint satisfaction problems (CS...