[datatable-help] Sumif

[Boris05036]

Hello! I am new in R and have a task.
I have a massive, for example:
region price
1        100
2        100
1        150
3        200
2        100
1        150
3        150
and so on.

I need to make 2 tables, that describes in descending order: 1) quantity of
rows for each region, 2) sum of prices in each region



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