August 2017
Beginner to intermediate
426 pages
9h 36m
English
Content preview from Learning Informatica PowerCenter 10.x - Second Edition
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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 ...
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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.