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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
256 9.4 Specialized Analytical Syntax
9.3.6 Aggregation Functions Allowing Analysis
Analytics is used to calculate cumulative, moving, centered, and reporting
summary aggregate values often used in data warehouse environments.
Unlike aggregate functions, analytical functions return multiple rows for
each group. Each grouping of rows is called a window and is effectively a
variable group, comprising of a range of rows. The number of rows in a
window can be based on a specified row count or an interval, such as a
period of time. Apart from the ORDER BY clause, analytical functions are
always executed at the end of a query statement. The following functions ...
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Publisher Resources

ISBN: 9781555583354