my bank a file in csv format, and I need to make a comparison of the next file that is inserted so that if it is the same it will deny the upload. I am a bit lost with this, has anyone done something like this before?
Google for something like "data hash" or "data digest". It's a small fingerprint of your data. So if you stored not only the file, but its hash also, you would be able to quickly understand whether incoming file is identical to the previous one or not. This technique is not specific to csv. And your description also doesn't look like something specific for csv. Or maybe I didn't understand it)
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