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Anonymous's avatar
Anonymous
Not applicable
8 years ago
Solved

Subtracting Dates within Two Different Tables

Hello,     I have a report I'm working on using DirectQuery. I'd like to subtract the difference in two dates that reside in two tables but based off a variable in one of the tables.   So, we ha...
  • Anonymous's avatar
    Anonymous
    8 years ago

    Anonymous,

    Create similar measures as below. If the DAX don't help, please share dummy data of your tables.

    Measure = CALCULATE(max(SCCalls[Create Date]),FILTER(SCCalls,SCCalls[Scall Type]="test2"))
    Difference = DATEDIFF(MAX(SCEquipments[Create Date]),SCEquipments[Measure],DAY)



    Regards,
    Lydia

  • Anonymous's avatar
    Anonymous
    8 years ago

    Anonymous,

    What if the type of CallTypeID? If it is numerical type, change your DAX to the following:

    Measure= CALCULATE(MAX(SCCalls[CreateDate]), FILTER(SCCalls, SCCalls[CallTypeID]=55))

    Regards,
    Lydia

  • Anonymous's avatar
    Anonymous
    8 years ago

    Anonymous,

    Right-click on your table , then select "New Measure" and apply your DAX.

    Regards,
    Lydia

Anonymous's avatar
Anonymous
Not applicable
8 years ago

Anonymous,

 

Yes, they are related by EquipmentID field. The formula I'm using is:

 

VALUE(DATEDIFF(SCEquipments[CreateDate],SCCalls[CreateDate],DAY))

 

The error it's producing is: A single value for column "CreateDate" in table "SCCalls" cannot be determined. This can happen when a measure formula refers to a column that contains many values without specifying an aggregation such as min, max, count, or sum to get a single result.

 

The issue is that each equipment can have multiple service calls. I'd like to subtract the dates from every service call and then filter the calls down to what I'm looking for but it seems I have to filter within the formula instead.

Anonymous's avatar
Anonymous
Not applicable
8 years ago

Anonymous,

Create similar measures as below. If the DAX don't help, please share dummy data of your tables.

Measure = CALCULATE(max(SCCalls[Create Date]),FILTER(SCCalls,SCCalls[Scall Type]="test2"))
Difference = DATEDIFF(MAX(SCEquipments[Create Date]),SCEquipments[Measure],DAY)



Regards,
Lydia

  • Anonymous's avatar
    Anonymous
    Not applicable
    8 years ago

    I'm still getting the same error. The two tables are quite large but here is some of the important information:

     

     

    Table FieldSample Data
    SCCalls.EquipmentID12345
    SCCalls.CallNumber201123
    SCCalls.CallTypeIDP
    SCCalls.CustomerID

    123

    SCCalls.CreateDate1/1/18 2:00pm
    SCCalls.CloseDate1/5/18 5:00pm
      
      
    Table FieldSample Data
    SCEquipments.EquipmentID12345
    SCEquipments.CustomerID

    123

    SCEquipments.CreateDate1/1/18 2:00pm
    SCEquipments.InstallDate1/2/16 3:00pm

     

    Let me know if I need to give you more information. 

    • Anonymous's avatar
      Anonymous
      Not applicable
      8 years ago

      Anonymous，

      Right click your table and choose new measure, then apply my DAX. If you still get issues, please post expected result based on the sample data you share and post a screenshot about your current scenario.

      Regards,
      Lydia

      • Anonymous's avatar
        Anonymous
        Not applicable
        8 years ago

        I was wrong about the CallTypeID above. Apparently it's one of the few ID's that have numerical values instead of letters.

         

        I put the measure in and got the below error.

         

         

        I tried adding the Value function right before the (SCCAlls[CallTypeID]="55")) but I got this:

         

         

        Thanks,