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LOOKUP TRANSFORMATION-
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Lookup transformation helps you to pull the matching record information from Source and Loads into Target.
Use a Lookup transformation to retrieve data based on a specified lookup condition.
For example,
you can use a Lookup transformation to retrieve values from a database table for codes used in source data.
When Lookup transformation to return a single row, the Lookup transformation is a passive transformation.
When Lookup transformation to return multiple rows, the Lookup transformation is an active transformation.
You can use multiple Lookup transformations in a mapping.
Two types of Lookup-
Connected
Unconnected.