Hello
I am currently using Excel 2010, trying to calculte a sum based on multiple if statements.
I have data similar to the following :
Month \ User ID \ Payment
8 \ 123 \ £20
8 \ 124 \ £5
9 \ 123 \ £15
9 \ 125 \ £22
9 \ 126 \ £3
I would like to count the number of new User ID's each month...