Use a vlookup to lookup up and count the amount of unique numbers

[Greg]

Can I use a VLOOKUP to return a count of unique values associated with
certain people? Ie. can I use a vlook up to lookup and then count of a number
of unique reference numbers associated with a person called 'John Smith' and
then put that count total in a particular cell?

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[T. Valko]

count of a number of unique reference numbers

...........A..........B
1.......Bill........10
2.......John........0
3.......John........0
4.......Sue.......10
5.......Sue.......10
6.......Lisa......20
7......Tom......10
8......John......10
9......John......10
10....John......20

Count unique numbers associated with John.

D1 = John

Try this array formula** :

=COUNT(1/FREQUENCY(IF(A1:A10=D1,IF(B1:B10<>"",B1:B10)),B1:B10))

Result = 3 (0,10,20)

** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER)