Hello,
Please help me on how to assign a sequential number to each unique entry.
I have the list of identifiers for different companies, e.g.:
A
A
A
AAI
AAI
AAPL
AAPL
I would like to assign a unique number to each company, e.g.:
A 1
A 1
A 1
AAI 2
AAI 2
AAPL 3
AAPL 3
Thank you
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