I've been searching and found a number of ways to manually delete duplicates
at any given time, but the way my code records data so frequently I would
like to be able to have it automatically detect and delete any records its
importing that have already been imported OR to just not import the records
that are duplicates. My program imports excel files according to recently
added files because some files I've already imported may get updated with
more recent data added onto the already existing data. How can I make my
program detect or check that the file I'm uploading has been imported before
and not import or record duplicate data?
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