DAX Column

[TonyGu]

I would like to have the Define column return 1, if ID only appear 1 time in that year. If that ID appear twice or more, return 1 for the earliest Month, and 0 for the rest month. Below is the result I want to get. Not sure if it is doable.

[v-xiaotang]

Hi @TonyGu 

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[Whitewater100]

Hello:

Give this a try. Hope it helps..

Define =

var yr = Data[Year]

var countinyear = COUNTROWS(

FILTER(Data, Data[Year] = yr))

return

IF(countinyear = 1 || Data[Mo] = 1,1,0)

[AlexisOlson]

You seem to be assuming that January is always the first month for each year with multiple rows in the Data table (e.g. this would not work if the first D row in the given example were deleted).

[AlexisOlson · Accepted solution]

You can just check if the month is the first one that year or not.

Try this as a calculated column:

Define =
VAR _FirstMonth =
    CALCULATE (
        MIN ( Table1[MONTH] ),
        ALLEXCEPT ( Table1, Table1[ID], Table1[YEAR] )
    )
RETURN
    IF ( Table1[MONTH] = _FirstMonth, 1, 0 )

[Greg_Deckler]

@TonyGu Maybe:

Define =
  VAR __ID = [ID]
  VAR __Year = [Year]
  VAR __Month = [Month]
  VAR __MinMonth = MINX(FILTER('Table',[ID] = __ID && [Year] = __Year),[Month])
  VAR __Table = SUMMARIZECOLUMNS('Table'[ID],'Table'[Year],"__Count",COUNTROWS('Table'))
RETURN
  SWITCH(TRUE(),
    COUNTROWS(FILTER(__Table,[ID] = __ID && [Year] = __Year)) = 1,1,
    __Month = __MinMonth, 1,
    0
  )