389 search results - page 19 / 78 » A Framework for the Investigation of Aggregate Functions in ... |
SIGMOD
2005
ACM
14 years 6 months ago
2005
ACM
A windowed query operator breaks a data stream into possibly overlapping subsets of data and computes results over each. Many stream systems can evaluate window aggregate queries....
EDBT
2009
ACM
13 years 4 months ago
2009
ACM
In this work, we focus on managing scientific environmental data, which are measurement readings collected from wireless sensors. In environmental science applications, raw sensor...
EDBT
2004
ACM
14 years 6 months ago
2004
ACM
Earlier work has demonstrated the effectiveness of in-network data aggregation in order to minimize the amount of messages exchanged during continuous queries in large sensor netwo...
SIGMOD
2002
ACM
14 years 6 months ago
2002
ACM
Time-parameterized queries (TP queries for short) retrieve (i) the actual result at the time that the query is issued, (ii) the validity period of the result given the current mot...
VLDB
2004
ACM
14 years 2 days ago
2004
ACM
We investigate the problem of ranking answers to a database query when many tuples are returned. We adapt and apply principles of probabilistic models from Information Retrieval f...