How to take a difference within the data of the same city but not across the city, Part 3

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alpedhuez
alpedhuez 2020-12-8
评论： alpedhuez 2020-12-8
I have a table
City Date Cumulative_Visitors
-----------------------
NY January 1 100
NY January 2 150
NY January 3 200
SF January 1 70
SF January 2 200
SF January 3 400
I explained the problem of calculating the new_visitors.
If I just use "diff", then, it will create a problem at the first entry of each city.
Then the idea is
run diff
then replace the first entry of each city with the cumulative_visitor of that day
How can one write "replace the first entry of each city with the cumulative_visitor of that day"?

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Ameer Hamza
Ameer Hamza 2020-12-8

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