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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Aggregating data
Suppose that you have a list of daily temperatures in a given country over a year. You may want to know the overall average temperature, the average temperature by region, or the coldest day in the year. In this section, you will learn how to solve these calculations with PDI, specifically with the Group by step.
The Group by step allows you to create groups of rows and calculate new fields over these groups. To understand how to do the aggregations, let's explain it by example. We will continue using the sales Transformation from the first section of the chapter. Now the objective will be as follows—for each pair product line/product code, perform the following:
- Calculate the total sales amount for each product
- Calculate ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.