Count Distinct only

[Guest]

Hi Guys, Problem I am trying to resolve is this, I am trying to extract data
from a table of data, I want the result to tell me the number of times a
certain piece of info appears ,,, example table
Product Code Cost
1 Pen 12345 £2:50
2 Pencil 13456 £1:00
3 Pen 12345 £2:50
4 Pen 12378 £2:50
5 Pen 12378 £2:50

Normmaly I would extract the number of times Pen appears by doing a simple
Countif on column A, however, I would like to extract the number of Codes
that appear in column B when Pen appears in column A, in the example above
the reult would be 4 fo column A, any ideas?

 

[Roger Govier]

Hi John

In your example every occurrence of Pen has a code so a Countif of Pen would
yield the same result.
If there is not always a code then
=SUMPRODUCT(--(A1:A5="Pen"),--(B1:B5<>""))
would yield an answer of 4, but a lower value in any codes were blank.

Regards

Roger Govier

 

[Guest]

Hi Roger, this wroks to a certain degree, however, is there a way to only
count the number of codes, excluding duplicates, i.e., if a code appears more
than once, only count it once?

 

[Bob Phillips]

John,

Try

=SUM(--(FREQUENCY(IF(A2:A100="Pen",MATCH(B2:B100,B2:B100,0)),ROW(INDIRECT("1
:"&ROWS(B2:B100))))>0))

which is an array formula, so commit with Ctrl-Shift-Enter

--

HTH

RP
(remove nothere from the email address if mailing direct)

 

[Guest]

Consider creating a helper column formed by concatinating Product and Code.

=A1 & B1

This would reduce your problem back to one dimension and you could still use
you countif technique.