389 search results - page 26 / 78 » A Framework for the Investigation of Aggregate Functions in ... |
ECAI
1998
Springer
13 years 10 months ago
1998
Springer
Abstract. We extend different Description Logics by concrete domains (such as integers and reals) and by aggregation functions over these domains (such as min;max;count;sum), which...
WWW
2006
ACM
14 years 7 months ago
2006
ACM
We introduce a new, powerful class of text proximity queries: find an instance of a given "answer type" (person, place, distance) near "selector" tokens matchi...
CSB
2005
IEEE
14 years 12 days ago
2005
IEEE
Specific topic search in the PubMed Database, one of the most important information resources for scientific community, presents a big challenge to the users. The researcher typic...
PODS
2000
ACM
13 years 11 months ago
2000
ACM
We study the problem of auditing databases which support statistical sum queries to protect the security of sensitive information; we focus on the special case in which the sensit...
ICDE
2007
IEEE
14 years 8 months ago
2007
IEEE
Incompleteness due to missing attribute values (aka "null values") is very common in autonomous web databases, on which user accesses are usually supported through media...