Until now, you have been working on individual rows. There are a lot of operations that work on the dataset as a whole. You just learned to sort the dataset, which is a starting point to implement a list of many other operations. The first and one of the most used in this category is the aggregation of data.
Working on groups of rows
Get Learning Pentaho Data Integration 8 CE - Third Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
