168 search results - page 4 / 34 » Efficient Creation of Statistics over Query Expressions |
VLDB
2001
ACM
13 years 11 months ago
2001
ACM
We demonstrate a visual based XML-Relational database system where XML data is managed by commercial RDBMS. A query interface enables users to form path expression based queries a...
BNCOD
2009
13 years 8 months ago
2009
We study the expressiveness of a positive fragment of path queries, denoted Path+ , on node-labeled trees documents. The expressiveness of Path+ is studied from two angles. First, ...
EDBTW
2006
Springer
13 years 10 months ago
2006
Springer
A data stream management system executes a large number of continuous queries in parallel. As stream characteristics and query workload change over time, the plan initially install...
STOC
1994
ACM
13 years 11 months ago
1994
ACM
We present new results on the well-studied problem of learning DNF expressions. We prove that an algorithm due to Kushilevitz and Mansour [13] can be used to weakly learn DNF form...
PPDP
2010
Springer
13 years 5 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...