I have a list of purchases in a spreadsheet (CSV, so I can do the operation in Excel or Google Sheet, doesn't matter), so single lines that include data like:
Date, Customer Email, Customer ID, Product
I'm struggling to find out the number of new customers per month.
I'm familiar with pivot tables, however, I think I need a formula or helper table prior to pivoting the data?!
Basically I need to identify when each Customer Email or Customer ID occurs for the first time.
The ideal desired output would be a (pivot?) table like:
Month, Number of new customers
January 2019, 100
February 2019, 120
...
As you can see I'm struggling a bit to put it into words, which might also be the reason why I'm struggling to find the answer that I'm sure is already out there.
Does anyone know what I mean, and have a hint in regards to how to achieve it?
Thanks in advance.