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Oracle Data Warehouse Tuning for 10g
book

Oracle Data Warehouse Tuning for 10g

by Gavin JT Powell
April 2011
Intermediate to advanced content levelIntermediate to advanced
504 pages
16h 49m
English
Digital Press
Content preview from Oracle Data Warehouse Tuning for 10g
216
8.2
GROUP BY Clause Extensions
tion of aggregations. These summaries are sometimes called super aggre-
gates, as they are in actuality aggregations of aggregations, or summaries
of summaries.
The ROLLUP Clause
. The ROLLUP clause is best suited to build
two-dimensional summaries over multiple hierarchical layers.
The CUBE Clause
. The CUBE clause is best suited to production of
multiple dimensional summaries from a two-dimensional structure of
dimension and fact entities.
The GROUPING SETS Clause
. The GROUPING SETS clause is
effectively a filter, allowing selection of only required groupings pro-
duced by the ROLLUP and CUBE clauses.
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Publisher Resources

ISBN: 9781555583354