Hello,
In the sheet attached i have a list of reservation numbers (B) and a list of identification numbers (A). What i would like to do is' for example, in cell H2, where the reservation number in column B =1 calculate the and display the number of unique identification numbers in column A.
Is this possible?
Last edited by jmcgallan; 03-02-2011 at 12:40 PM.
What would be different then the existing formula, =IF(D2="ja",COUNTIF($B:$B,B2),"")
it seems that you only have unique numbers in column A and that the column B values are grouped together...
an alternative that doesn't rely on column D would be:
=IF(B2<>B1,COUNTIF(B:B,B2),"")
Where there is a will there are many ways.
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Thanks,
You're right, most of the time the numbers in column A are unique but on the odd occation (a bit further down the sheet...e.g. row 74) where the ID is not unique, so i would expect the result to be 1
try then:
confirmed with CTRL+SHIFT+ENTER not just ENTER and copied down.
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Genius, thanks
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