620 search results - page 20 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
140
Voted
IS
2012
13 years 10 months ago
2012
When transforming data one often wants certain information in the data source to be preserved, i.e., we identify parts of the source data and require these parts to be transformed...
124
click to vote
DOLAP
2000
ACM
15 years 7 months ago
2000
ACM
Being able to efficiently answer arbitrary OLAP queries that aggregate along any combination of dimensions over numerical and categorical attributes has been a continued, major co...
229
Voted
ICDE
2006
IEEE
16 years 4 months ago
2006
IEEE
We consider the problem of creating a sample view of a database table. A sample view is an indexed, materialized view that permits efficient sampling from an arbitrary range query...
146
Voted
SSD
2005
Springer
15 years 8 months ago
2005
Springer
Abstract. A top-k OLAP query groups measures with respect to some abstraction level of interesting dimensions and selects the k groups with the highest aggregate value. An example ...
138
Voted
DAWAK
2000
Springer
15 years 7 months ago
2000
Springer
In the context of multidimensional databases implemented on relational DBMSs through star schemes, the most effective technique to enhance performances consists of materializing re...