620 search results - page 42 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
210
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SIGMOD
2009
ACM
16 years 4 months ago
2009
ACM
Enabling keyword queries over relational databases (KQDB) benefits a large population of users who have difficulty in understanding the database schema or using SQLs. However, sin...
134
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SIGMOD
1999
ACM
15 years 8 months ago
1999
ACM
In this paper we present a mechanism for translating constraint queries, i.e., Boolean expressions of constraints, across heterogeneous information sources. Integrating such syste...
134
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SIGMOD
1997
ACM
15 years 8 months ago
1997
ACM
: The read-mostly environment of data warehousing makes it possible to use more complex indexes to speed up queries than in situations where concurrent updatesare present. The curr...
172
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KRDB
1997
15 years 5 months ago
1997
A data warehouse is a redundant collection of data replicated from several possibly distributed and loosely coupled source databases, organized to answer OLAP queries. Relational ...
132
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DKE
2002
15 years 3 months ago
2002
An important issue in data warehouse development is the selection of a set of views to materialize in order to accelerate OLAP queries, given certain space and maintenance time co...