Excel: count number of unique/distinct row in range with condition

Posted by Bertvan on Super User See other posts from Super User or by Bertvan
Published on 2012-09-28T22:16:48Z Indexed on 2012/09/29 3:42 UTC
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microsoft-excel

I have a an excel sheet with:

in Col A: week numbers
in Col B: dates (timesheet entries)

I need to know the number of days worked for each week, so I need to the number of unique date entries per week number.

I found formula's (both array as non-array) that handle this for a fixed range, but I want to have the results in another column per week number.

So, the result of the added dataset below would be (the colon is just for clarity):

14: 2

15: 3

17: 6

20: 2

21: 3

If this is the source data:

14: 4/04/2012

15: 10/04/2012

15: 11/04/2012

17: 26/04/2012

17: 27/04/2012

20: 14/05/2012

21: 23/05/2012

21: 25/05/2012

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