Find unique number for every group in data.table

Channel:
Peter Schneider
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Published on ● Video Link: https://www.youtube.com/watch?v=PY6Q6kRa-AE


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Find unique number for every group in data.table
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(stackoverflow.com/users/16611809/gernophil)gernophil
(stackoverflow.com/collectives/r-language)
(stackoverflow.com/users/6574038/jay-sf)jay.sf
(stackoverflow.com/users/7272478/ehsan-hamzei)Ehsan Hamzei
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Tags:
data.table