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Learning Informatica PowerCenter 10.x

You're reading from   Learning Informatica PowerCenter 10.x Enterprise data warehousing and intelligent data centers for efficient data management solutions

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Product type Paperback
Published in Aug 2017
Publisher
ISBN-13 9781788471220
Length 426 pages
Edition 2nd Edition
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Author (1):
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Rahul Malewar Rahul Malewar
Author Profile Icon Rahul Malewar
Rahul Malewar
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Table of Contents (13) Chapters Close

Preface 1. Downloading and Extracting Informatica PowerCenter Software FREE CHAPTER 2. Understanding Admin Console 3. Understanding Designer Screen and its Components 4. The Lifeline of Informatica - Transformations 5. Using the Designer Screen - Advanced Features 6. Implementing SCD Using Designer Screen Wizards 7. Using the Workflow Manager Screen 8. Learning Various Tasks in Workflow Manager screen 9. Advanced Features of Workflow Manager Screen 10. Working with Workflow Monitor - Monitoring the code 11. The Deployment Phase - Using Repository Manager 12. Optimization - Performance Tuning

Union transformation


Union transformation is used to the merge data from multiple sources. A union is a multiple-input-single-output transformation. This is the opposite of the router transformation that we discussed earlier. The basic criterion for using union transformation is that you should have data with matching data type. If you do not have data with matching data type coming from multiple sources, union transformation will not work. Union transformation merges the data coming from multiple sources and does not remove duplicates, that is. it acts as UNION ALL of SQL statements.

As mentioned previously, Union requires data coming from multiple sources. It reads the data concurrently from multiple sources and processes the data. You can use heterogeneous sources to merge the data using Union transformation.

A mapping indicating the Union transformation is shown in the following screenshot:

Working on Union transformation is a little different from working on other transformations, which...

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