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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
5.2
Dimension Object Syntax 121
Chapter 5
There is a problem with the schema shown in Figure 5.6 in that it does
not properly represent a hierarchy. The only way to represent this particular
structure is by using two hierarchies, because NULL-valued and non NULL-
valued states cannot be represented by a single structure, see Figure 5.7.
Figure 5.6
Normalizing
locations.
Figure 5.7
There are two
options for a
hierarchy.
122
5.2
Dimension Object Syntax
There will now be two CREATE DIMENSION statements in order to
cater for locations, as shown below:
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Publisher Resources

ISBN: 9781555583354