=SUM(N(FREQUENCY(IF(rngJ="B",MATCH(rngD&"",rngD&"" ,)),MATCH(rngD&"",rngD&"",))0))

ctrl+shift+enter, not just enter


"Mero" wrote:

Hello, Need to know how to count the letter "B" in column J based on unique
values among duplicates in another column.

Column D Column J
5020598285 A
5020598286 A
5020598287 A
5020598288 A
5020598563 A
8020249197 C
8020249198 C
8020249409 B
8020249409 B
8020249450 B
8020249450 B
5020598429 B
5020598707 B

If you have a look at records in column D, you will find that some records
are duplicated. If I count letter "B", I will get 4 but actually they are
only 2 records for letter "B" as 8020249409 and 8020249409 are duplicated.
I need a function to count letter "B" without duplication.

Hope I've explained my problem.
Your fast support is really appreciated.

Many Thanks
Mero