One way
In say, B1:
=SUMPRODUCT((A1:A10<"")/COUNTIF(A1:A10,A1:A10&""))
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xdemechanik
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"auyantepui" wrote:
how can I count equal numbers in colum A as unique ones? for example:

Regardless there are 3 (6452301) i need to count them as one Sales Order and
not as three, as so on:

6452302
6452301
6452301
6452301
6452303
6452303
6452303