439 search results - page 9 / 88 » Unnesting Arbitrary Queries |
JLP
2000
13 years 9 months ago
2000
Generating query-answering plans for data integration systems requires to translate a user query, formulated in terms of a mediated schema, to a query that uses relations that are...
CORR
2011
Springer
13 years 5 months ago
2011
Springer
We study in this paper provenance information for queries with aggregation. Provenance information was studied in the context of various query languages that do not allow for aggr...
ICDE
2006
IEEE
14 years 11 months ago
2006
IEEE
In this paper, we propose DBSampler, a query execution mechanism to answer "partial selection" queries in peerto-peer databases. A partial selection query is an arbitrar...
PDPTA
2007
13 years 11 months ago
2007
: The ability to estimate the communication latency between arbitrary hosts on the Internet would enable the distributed computing applications to find the closest server or to fin...
VLDB
2005
ACM
14 years 3 months ago
2005
ACM
In an “uncertain database”, an object o is associated with a multi-dimensional probability density function (pdf), which describes the likelihood that o appears at each positi...