Forum Discussion

TcT85's avatar
TcT85
Helper III
4 years ago
Solved

Direct Query compatible DAX calculation on time difference

Hi,   Need some help with this DAX formula.   Im using direct query and I have tried to some dax formula that was not compatible with Direct Query. I need to calculate the minimum cycle time for...
Need help with DAX
  • Icey's avatar
    Icey
    4 years ago

    Hi TcT85 ,

     

    Please check if this is what you want:

    DAX Date Previous1 =
VAR CurDate_ =
    MAX ( PD_PcbProductionData[Finished Date] )
VAR CurProduct_ =
    MAX ( PD_PcbProductionData[Product] )
RETURN
    CALCULATE (
        MAX ( PD_PcbProductionData[Finished Date] ),
        PD_PcbProductionData[Product] = CurProduct_,
        PD_PcbProductionData[Finished Date] < CurDate_,
        ALLSELECTED ( PD_PcbProductionData )
    )

     

    EARLIER function is mostly used in the context of calculated columns. It is not supported in this scenario.

     

     

    Best Regards,

    Icey

     

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

  • Icey's avatar
    Icey
    4 years ago

    Hi TcT85 ,

     

    Use MAX() / MIN() function like so:

    Measure =
DATEDIFF (
    MAX ( PD_PcbProductionData[Finished Date] ),
    [DAX Date Previous1],
    SECOND
)

     

    Best Regards,

    Icey

     

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

TcT85's avatar
TcT85
Helper III
4 years ago

Hi,

 

I followed microsoft suggestion to first create this colum

DAX Date Previous1 =
CALCULATE (
MAX ( PD_PcbProductionData[SEL_LOD_LatestStartDateTime] ),
ALLEXCEPT ( PD_PcbProductionData, PD_PcbProductionData[PcbSerialNumber] ),
PD_PcbProductionData[SEL_LOD_LatestStartDateTime] < EARLIER ( 'PD_PcbProductionData'[SEL_LOD_LatestStartDateTime] ))
 
But here it says Calculate is not allowed in a DAX expression for Direct query model.
 
If previous column worked i would try to follow up with this secondary dax formula.
 
Date Diff in Days =
IF (
ISBLANK ( 'View Name'[Date Previous] ),
1,
DATEDIFF (
'View Name'[Date Previous],
'View Name'[Date],
DAY
)
)

But I would replace DAY with Second

 

Not sure if this would work though

 

 

 

Icey's avatar
Icey
Community Support
4 years ago

Hi TcT85 ,

 

Please check if this is what you want:

DAX Date Previous1 =
VAR CurDate_ =
    MAX ( PD_PcbProductionData[Finished Date] )
VAR CurProduct_ =
    MAX ( PD_PcbProductionData[Product] )
RETURN
    CALCULATE (
        MAX ( PD_PcbProductionData[Finished Date] ),
        PD_PcbProductionData[Product] = CurProduct_,
        PD_PcbProductionData[Finished Date] < CurDate_,
        ALLSELECTED ( PD_PcbProductionData )
    )

 

EARLIER function is mostly used in the context of calculated columns. It is not supported in this scenario.

 

 

Best Regards,

Icey

 

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

  • TcT85's avatar
    TcT85
    Helper III
    4 years ago

    Hi Icey,

     

    Thanks for the DAX formula.

     

    This is the key for me to calculate the cycle time.

     

    When i use Datediff to get the cycle time number, it says that function calculate is not allowed for a new column. in direct query model.

     

     

     

    • Icey's avatar
      Icey
      Community Support
      4 years ago

      Hi TcT85 ,

       

      Use MAX() / MIN() function like so:

      Measure =
DATEDIFF (
    MAX ( PD_PcbProductionData[Finished Date] ),
    [DAX Date Previous1],
    SECOND
)

       

      Best Regards,

      Icey

       

      If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

      • TcT85's avatar
        TcT85
        Helper III
        4 years ago

        Yes, it works!!! Thanks Icey!

         

        I added ABS to remove the minus value, not sure if this is the best solution.

        Dax Measure = 
VAR Datedifferent= DATEDIFF (
    MAX( PD_PcbProductionData[SEL_LOD_LatestEndDateTime] ),
    [DAX Date Previous2],
    SECOND
)
Return
ABS(Datedifferent)

         

        One more question.

         

        How can i Sum all the measure values?

        Dax Total Measure = CALCULATE(PD_PcbProductionData[Dax Measure])

        I tried to sum the measure values, but it doesnt calculate correct.

        For some reason it only takes the latest value that is 556 at the image below.