3652 search results - page 165 / 731 » A study of query length |
CORR
2007
Springer
13 years 8 months ago
2007
Springer
We address the problem of answering Web ontology queries efficiently. An ontology is formalized as a Deductive Ontology Base (DOB), a deductive database that comprises the ontology...
CORR
1999
Springer
13 years 7 months ago
1999
Springer
Complex queries are becoming commonplace, with the growing use of decision support systems. These complex queries often have a lot of common sub-expressions, either within a singl...
ICDE
2012
IEEE
11 years 10 months ago
2012
IEEE
Abstract—After decades of effort working on database performance, the quality and the usability of database systems have received more attention in recent years. In particular, t...
ICDE
2006
IEEE
14 years 9 months ago
2006
IEEE
In this paper, we present the ArchIS system that achieves full-functionality transaction-time databases without requiring temporal extensions in XML or database standards. ArchIS&...
SIGMOD
2004
ACM
14 years 8 months ago
2004
ACM
Existing SQL aggregate functions present important limitations to compute percentages. This article proposes two SQL aggregate functions to compute percentages addressing such lim...