721 search results - page 46 / 145 » Supporting top-k join queries in relational databases |
SSDBM
1998
IEEE
15 years 2 months ago
1998
IEEE
A relation is an unordered collection of records. Often, however, there is an underlying order (e.g., a sequence of stock prices), and users want to pose queries that reflect this...
EDBT
2008
ACM
15 years 9 months ago
2008
ACM
In this paper we study the problem of mining all frequent queries in a given database table, a problem known to be intractable even for conjunctive queries. We restrict our attent...
103
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VLDB
1991
ACM
15 years 1 months ago
1991
ACM
Systems designed for efficient retrieval of conventional data can be very inefficient at retrieving documents. Documents have more complex structure than conventional data, and th...
156
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GIS
2007
ACM
15 years 10 months ago
2007
ACM
Many Geographic Information System (GIS) applications must handle large geospatial datasets stored in raster representation. Spatial joins over raster data are important queries i...
146
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SIGMOD
2008
ACM
15 years 10 months ago
2008
ACM
The emergence of database languages with side effects, notably for XML, raises significant challenges for database compilers and optimizers. In this paper, we extend an algebra fo...