I need a formula that returns how many times an unique value appears in a given date

Question

In a spreadsheet in Google Spreadsheets, I`m trying to solve this:

17/02/2012  banana
17/02/2012  banana
17/02/2012  banana
17/02/2012  apple
18/02/2012  apple
18/02/2012  apple

I need a formula that returns how many times an unique value appears in a given date.

Example:

17/02/2012 - two unique values 
18/02/2012 - one unique value

Anyone can help?

Answer 1

To do this, you would use something like this:

=ARRAYFORMULA(UNIQUE(B5:C10))

Assuming your range is in B5:C10. You may have to adjust the range.