505 search results - page 33 / 101 » Queries with Incomplete Answers over Semistructured Data |
99
Voted
DLOG
2008
15 years 59 min ago
2008
Answering queries posed over knowledge bases is a central problem in knowledge representation and database theory. In databases, query containment is one of the important query op...
100
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EDBT
2009
ACM
15 years 4 months ago
2009
ACM
Twig queries have been extensively studied as a major fragment of XPATH queries to query XML data. In this paper, we study PXMLRANK query, (Q, k), which is to rank top-k probabili...
162
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SIGMOD
2008
ACM
15 years 9 months ago
2008
ACM
Reverse skyline queries over uncertain databases have many important applications such as sensor data monitoring and business planning. Due to the existence of uncertainty in many...
72
Voted
VLDB
2001
ACM
15 years 2 months ago
2001
ACM
Estimating the number of distinct values is a wellstudied problem, due to its frequent occurrence in queries and its importance in selecting good query plans. Previous work has sh...
135
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ICDE
2012
IEEE
13 years 9 months ago
2012
IEEE
Top-k pairs queries have received significant attention by the research community. k-closest pairs queries, k-furthest pairs queries and their variants are among the most well stu...