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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Obtaining the surrogate key for a time dimension
In the case of a time dimension, if the key is the date in numeric format, the method to get the surrogate key is simply changing the metadata for the date, in the same way we did when loading the dimension: from date to string first, and then from string to number.
If, instead of the date you have a regular surrogate key, you can use a Database lookup step to get the surrogate key.
The following table summarizes the different possibilities to get surrogate keys:
|
Dimension type |
Method to get the surrogate key |
Sample dimension |
|
Type I SCD |
Database lookup step. |
REGIONS |
|
Type II SCD |
Dimension L/U step. |
PUZZLES |
|
Junk and Mini |
Combination L/U step if you load the dimension ... |
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