Pandas 'count(distinct)' equivalent

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Chapters
00:00 Question
00:48 Accepted answer (Score 575)
01:16 Answer 2 (Score 130)
01:34 Answer 3 (Score 53)
01:51 Answer 4 (Score 19)
02:16 Thank you

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Full question
https://stackoverflow.com/questions/1541...

Question links:
[Oracle]: https://en.wikipedia.org/wiki/Oracle_Dat...
[SQL Server]: https://en.wikipedia.org/wiki/Microsoft_...

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Tags
#python #pandas #count #groupby #distinct

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