December 2017
Beginner to intermediate
500 pages
12h 10m
English
book
Learning Pentaho Data Integration 8 CE - Third Edition
by Dan Keeley, Diethard Steiner, María Carina Roldán, Miguel Gaspar, Pablo Castagnaro, Paula Clemente, Paulo Alexandre de Oliveira Rodrigues Pires
Content preview from Learning Pentaho Data Integration 8 CE - Third Edition
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Learning the basics of dimensions
Dimensions are sets of attributes used to describe a business. A list of products along with their shape, color, or size is a typical example of dimension. Dimensions are one of the basic blocks of a data warehouse or data mart.
A dimension has the purpose of grouping, filtering, and describing data. Think of a typical report you would like to have—sales grouped by region, by customer, and method of payment that are ordered by date. The by word lets you identify potential dimensions—regions, customers, methods of payment, and dates.
If we look at our sample Jigsaw database, we can think of many dimensions, for example:
|
Dimension |
Description |
|
Time |
The date on which the sales occurred |
|
Regions ... |
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