Mappings are units of code that read data off one or more
sources, optionally transform it and write it to one or more targets. A
mapping, in its simplest form, is a data flow that defines how the data
moves
from a given source to a given target and how it is to be transformed in
between. In a simple pass through mapping, the data is written as-it-is
to the
target without any changes. In a more complex mapping, data may perform
change detection, then sort, aggregate and finally calculate summary of
transactions and load them to the target.
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