6846 search results - page 84 / 1370 » Querying a summary of database |
ICDT
2007
ACM
15 years 4 months ago
2007
ACM
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
CLEF
2004
Springer
15 years 3 months ago
2004
Springer
Abstract. This paper describes an experimental investigation of interactive techniques for cross-language information access. The task was to answer factual questions from a large ...
PODS
2001
ACM
15 years 10 months ago
2001
ACM
The need to search for complex and recurring patterns in database sequences is shared by many applications. In this paper, we discuss how to express and support efficiently sophis...
WIDM
2003
ACM
15 years 3 months ago
2003
ACM
A growing number of databases especially those published on the Web are becoming available to external users. Users of these databases are provided simple form-based query interfa...
AMAI
2007
Springer
14 years 10 months ago
2007
Springer
We present here a formal foundation for an iterative and incremental approach to constructing and evaluating preference queries. Our main focus is query modification: a query tran...