750 search results - page 116 / 150 » Aggregates in Possibilistic Databases |
VLDB
2004
ACM
14 years 3 months ago
2004
ACM
We address the problem of computing approximate answers to continuous sliding-window joins over data streams when the available memory may be insufficient to keep the entire join...
ICDE
2010
IEEE
14 years 3 months ago
2010
IEEE
Abstract— Sensor networks have evolved to a powerful infrastructure component for event monitoring in many application scenarios. In addition to simple filter and aggregation op...
EDBT
2009
ACM
14 years 2 months ago
2009
ACM
Data provenance is essential in applications such as scientific computing, curated databases, and data warehouses. Several systems have been developed that provide provenance fun...
IDEAS
2000
IEEE
14 years 2 months ago
2000
IEEE
Most operations of the relational algebra or SQL - like projection with duplicate elimination, join, ordering, group by and aggregations - are efficiently processed using a sorted...
DEXAW
1998
IEEE
14 years 2 months ago
1998
IEEE
Materialized views offer opportunities for significant performance gain in query evaluation by providing fast access to pre-computed data. The question of when and how to use a ma...