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Extract and compare
Extract and compare is a step that despite being pretty self explanatory assumes there is a key designated and that the data extraction will work.
This step is very useful when is performed with a saved or recurrent comparison, if there is no key designated JuxtAPPose will assume and ask if it's OK to use the first column, at this point you can cancel the comparison.
If anything fails because as part of the data set one of the columns is missing or an extract couldn't be completed the tool will trigger an error message.
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