How to count duplicate values only once in a column

[Blizzard]

Hi all,

I want to identify in a column (not as a measure) all values for a specific ID only once. 

ID	Date	Unique
10	09.11.2017	YES
2	01.12.2017	YES
10	11.11.2011	NO

The respective formular in Excel works fine as follows:

=IF(MATCH(A4,A:A,0)=ROW(),"YES","NO")

What I wanted to do is, that the last entry of an ID is identified as unique (column C) and all past values of the same ID should be marked as "no". Therefore the DISTINCTCOUNT formular with filter is not working. In that case, all double values would be counted > 1. For ID 10 the outcoume would be 2 for both rows but I want to count ID excatly one time as unique.

I dont want to delete duplicate rows.

Does anyone has an idea how to solve that problem?

Regards

Michael

[Vvelarde · Accepted solution]

@Blizzard

Hi, try with this calculated column

Unique =
IF (
    CALCULATE (
        MAX ( Table1[Date] );
        FILTER ( Table1; Table1[ID] = EARLIER ( Table1[ID] ) )
    )
        = Table1[Date];
    "Yes";
    "No"
)

Regards

Victor

Lima - Peru

[Blizzard]

@Vvelarde

Hi Victor,

your solution worked perfect. I had to change the initial idea from the latest to the earliest date, but that was easy with your solution!

Thanks a lot,

Michael