Answer Posted / ashis
Add to sweta's answer:
We use lookup transformation to lookup data from a
relational table, view, synonym or flatfile against another
or the same table, view, synonym or flatfile.
This is mainly(not only)used for SCD's. So that the value
in the source can be compared with the existing target.
Lookup transformation are of different types named and
unnamed.
Mostly used lookup transformation types are Connected lookup
(Persistent Lookup, Dynamic lookup, Cached lookup, Uncached
lookup)
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