firstnonblank or MAX - measure to return the first value in a column based on another column

[PhoenixBird66]

I'm having real problems writing a measure to return the first value in a column based on whether another column is blank or not.

I have 2 tables - Price History and Sales. They are joined by a one to many relationship based on a key (a concatentation of service code & unit price.).

I want to write a measure that will return the first (as in earliest) value where the Quantity Sold is not blank for each part (or StdSvcKey). So in the case below the number I want for this part is £621.86.

I've tried 2 different methods so far but they dont do what i want.

I tried:

= FIRSTNONBLANK(PRICEHISTORY[Unit Price],0)

But this retruned the value £0.01

I also tried adding a caluclated column (DaysSincePriceChanged) to give me the number of days since the start date of the price change, so that I could then use MAX:

  =  CALCULATE(

   MAX( PRICEHISTORY [Unit Price]),

   KEEPFILTERS(

FILTER(

       PRICEHISTORY ,

   PRICEHISTORY [DaysSincePriceChanged] = CALCULATE(MAX(PRICEHISTORY [DaysSincePriceChanged]), ALLEXCEPT(PRICEHISTORY , PRICEHISTORY [StdSvcKey]))

     )

   ),

   ALLEXCEPT(PRICEHISTORY ,  PRICEHISTORY [StdSvcKey])

)

but this returns a value of £604.80, so thats not right either.

Any ideas guys?

[v-jiascu-msft · Accepted solution]

Hi @PhoenixBird66 ,

Please try this formula below, which is more intuitive. 

Measure 2 =
MINX (
    TOPN (
        1,
        FILTER ( 'Table1', 'Table1'[Quantity Sold] <> BLANK () ),
        Table1[Start Date], ASC
    ),
    [Unit Price]
)

Best Regards,

[v-jiascu-msft]

Hi @PhoenixBird66 ,

Try this simpler one. The key point here is the row context that we need to convert.

Measure =
FIRSTNONBLANK (
    Table1[Unit Price],
    CALCULATE ( SUM ( Table1[Quantity Sold] ) )
)

Best Regards,

[PhoenixBird66]

Thanks for your response.

I've tried this but it seems to be picking up the first (as in smallest) value rather than the first (as in oldest value). So in this example it returns the value £25.12, but I want it to return the value £26.00.

I need it to return the OLDEST unit price (based on the Start Date column) where the Quantity Sold is not blank or zero.

[v-jiascu-msft · Accepted solution]

Hi @PhoenixBird66 ,

Could you please mark the proper answers as solutions?

Best Regards,

[v-jiascu-msft · Accepted solution]

Hi @PhoenixBird66 ,

Please try this formula below, which is more intuitive. 

Measure 2 =
MINX (
    TOPN (
        1,
        FILTER ( 'Table1', 'Table1'[Quantity Sold] <> BLANK () ),
        Table1[Start Date], ASC
    ),
    [Unit Price]
)

Best Regards,

[Anonymous]

hi,

this might be happening because you have some page filter on.

please see the link below, this will give you a clear understanding

Link