Filter column values based on 2 other columns

Hello Pierre,

There could be better method but this DAX also works if you have a unique field the data set:

Distinct WD =
IF (
CALCULATE (
COUNTROWS ( Table1 ),
ALLEXCEPT ( Table1, Table1[Name], Table1[Date] ),
EARLIER ( Table1[Id] ) >= Table1[Id]
)
= 1,
[This Month],
0
)

Thanks,
Prakash

Hello Pierre,

The AllEXCEPT gives the all rows of the table (for each Name and Date pair) and earlier gives the current row.
When we count all Id where Name and Date is equal AND current Id is >= all Id, we are left with the correct count.

The >= might be confusing. Please see below MSDN link where earlier has been described in detail:

https://msdn.microsoft.com/en-us/library/ee634551.aspx

Thanks,
Prakash