135 search results - page 12 / 27 » Answering aggregate keyword queries on relational databases ... |
VLDB
2000
ACM
13 years 11 months ago
2000
ACM
Approximate query answering systems provide very fast alternatives to OLAP systems when applications are tolerant to small errors in query answers. Current sampling-based approach...
PODS
2009
ACM
14 years 8 months ago
2009
ACM
We consider the problem of deciding query equivalence for a conjunctive language in which queries output complex objects composed from a mixture of nested, unordered collection ty...
IS
2006
13 years 7 months ago
2006
In-network data aggregation has been recently proposed as an effective means to reduce the number of messages exchanged in wireless sensor networks. Nodes of the network form an a...
PODS
2004
ACM
14 years 7 months ago
2004
ACM
Data exchange is the problem of taking data structured under a source schema and creating an instance of a target schema. Given a source instance, there may be many solutions ? ta...
CORR
2002
Springer
13 years 7 months ago
2002
Springer
We address the problem of minimal-change integrity maintenance in the context of integrity constraints in relational databases. We assume that integrity-restoration actions are li...