549 search results - page 13 / 110 » Data Expiration and Aggregate Queries |
CIDM
2007
IEEE
15 years 3 months ago
2007
IEEE
— To generate plans for collecting data for data mining, an important problem is information volatility during planning: the information needed by the planning system may change ...
158
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SIGMOD
2005
ACM
15 years 9 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....
DAWAK
2003
Springer
15 years 2 months ago
2003
Springer
We introduce a new method for optimization of SQL queries with nested subqueries. The method is based on the idea of Boolean aggregates, aggregates that compute the conjunction or ...
75
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ICDM
2007
IEEE
15 years 3 months ago
2007
IEEE
Data security is a critical issue for many organizations. Sensitive data must be protected from both inside and outside attackers. Access control policies and related mechanisms h...
141
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PODS
2011
ACM
14 years 11 days ago
2011
ACM
Database queries can be broadly classified into two categories: reporting queries and aggregation queries. The former retrieves a collection of records from the database that mat...