6654 search results - page 211 / 1331 » Querying Faceted Databases |
128
Voted
VLDB
2004
ACM
15 years 9 months ago
2004
ACM
PIVOT and UNPIVOT, two operators on tabular data that exchange rows and columns, enable data transformations useful in data modeling, data analysis, and data presentation. They ca...
259
Voted
ICDE
2009
IEEE
16 years 5 months ago
2009
IEEE
Abstract-- In sensor environments and moving robot applications, the position of an object is often known imprecisely because of measurement error and/or movement of the object. In...
157
Voted
DLOG
2011
14 years 7 months ago
2011
We show that, although conjunctive queries over OWL 2 QL ontologies are reducible to database queries, no algorithm can construct such a reduction in polynomial time without changi...
136
Voted
SIGMOD
2010
ACM
15 years 8 months ago
2010
ACM
Many web queries seek information about named entities (such as products or people). Web search engines federate such entity-oriented queries to relevant structured databases; the...
128
Voted
PODS
2003
ACM
16 years 3 months ago
2003
ACM
In this paper we consider general path constraints for semistructured databases. Our general constraints do not suffer from the limitations of the path constraints previously stud...