6974 search results - page 20 / 1395 » Querying Semi-Structured Data |
PODS
2000
ACM
14 years 3 days ago
2000
ACM
The problem of query containment is fundamental to many aspects of database systems, including query optimization, determining independence of queries from updates, and rewriting ...
RTCSA
2007
IEEE
14 years 2 months ago
2007
IEEE
RFID middleware systems collect and filter RFID streaming data gathered continuously by numerous readers to process requests from applications. These requests are called continuou...
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
We study the problem of querying data sources that accept only a limited set of queries, such as sources accessible by Web services which can implement very large (potentially inf...
DL
1998
Springer
13 years 12 months ago
1998
Springer
This paper reports results from a failure analysis (i.e., incorrect query construction) of 51,473 queries from 18,113 users of Excite, a major Web search engine. Given that many d...
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...