Forum Discussion

elietech's avatar
elietech
Icon for Helper II rankHelper II
5 years ago
Solved

Transform and summarize data from one table into another...

Ok, here is the problem I am faced with.     I have a data set that records everytime a piece of equipment is removed from service for being unserviceable, and records the time it went "DOWN" (remo...
Need Help
  • MFelix's avatar
    MFelix
    5 years ago

    Hi elietech .

     

    The error was related with the calculation when you have a single day, I already fixed it by changing the formula to:

    measure = 
VAR Date_Selection =
    MAX ( 'Dates'[Date] )
VAR Date_Selection_Next = Date_Selection + 1
VAR temp_table =
    FILTER (
        ADDCOLUMNS (
            UpDown;
            "Start";
                DATE ( YEAR ( UpDown[DOWN_START] ); MONTH ( UpDown[DOWN_START] ); DAY ( UpDown[DOWN_START] ) );
            "End";
                DATE ( YEAR ( UpDown[DOWN_STOP] ); MONTH ( UpDown[DOWN_STOP] ); DAY ( UpDown[DOWN_STOP] ) )
        );
        [Start] <= Date_Selection
            && [End] >= Date_Selection
    )
VAR DateStart =
    IF (
        MINX ( temp_table; UpDown[DOWN_START] ) <= Date_Selection;
        Date_Selection;
        MINX ( temp_table; UpDown[DOWN_START] )
    )
VAR DateEnd =
    IF (
        MAXX ( temp_table; UpDown[DOWN_STOP] ) >= Date_Selection_Next;
        Date_Selection_Next;
        MAXX ( temp_table; UpDown[DOWN_STOP] )
    )
VAR Same_day_selection =
    IF (
        MAXX ( temp_table; [Start] ) = MINX ( temp_table; [End] )
            && MINX ( temp_table; UpDown[DOWN_START] ) >= Date_Selection;
        1
    )
RETURN
    IF (
        DateEnd = BLANK ();
        1440;
        IF (
            Same_day_selection = BLANK ();
            DATEDIFF ( Date_Selection; DateStart; MINUTE )
                + DATEDIFF ( DateEnd; Date_Selection_Next; MINUTE );
            1440
                - CALCULATE (
                    SUM ( UpDown[DOWN_DURATION] );
                    FILTER ( temp_table; UpDown[DOWN_START] = DateStart )
                )
        )
    )

     

    Check result below and attach.

     

elietech's avatar
elietech
Icon for Helper II rankHelper II
5 years ago

Sorry for the delayed response...this looks very promising....one quick question before I start digging into it....my model already contains a "date/calendar" table...would I need to make another one?  Or can I use the existing one?   And yes, I do have an "Equipment" table that is relatable to the Up/Down events data....

 

Can't wait to give this a try...definately a level of DAX beyond what I am normally able to dream up on my own 🙂  I'm constantly amazed by the help and support I can find on this community. 

 

 

MFelix's avatar
MFelix
Icon for Super User rankSuper User
5 years ago

Hi elietech,

 

I use a unrelated table but the use of this other table depends on the relationship you have on your model. 

 

How does the date table relates with the other tables in the model? 

  • elietech's avatar
    elietech
    Icon for Helper II rankHelper II
    5 years ago

     Ok, so I implemented your recomended DAX code, and it appears to work, in most situations, but i'm getting some odd results of very large negative numbers, and I can't determine the cause.  I mocked up a report using one month of my data, and I've attached the PBIX file...an ideas on where to start? 

     

     

    Guess I can't attach files...here is a link to my file in Onedrive

    https://1drv.ms/u/s!AswWQQBlp11ZvN1P6rRn-dCyWu7dbw?e=9Hho0X 

    • MFelix's avatar
      MFelix
      Icon for Super User rankSuper User
      5 years ago

      Hi elietech .

       

      The error was related with the calculation when you have a single day, I already fixed it by changing the formula to:

      measure = 
VAR Date_Selection =
    MAX ( 'Dates'[Date] )
VAR Date_Selection_Next = Date_Selection + 1
VAR temp_table =
    FILTER (
        ADDCOLUMNS (
            UpDown;
            "Start";
                DATE ( YEAR ( UpDown[DOWN_START] ); MONTH ( UpDown[DOWN_START] ); DAY ( UpDown[DOWN_START] ) );
            "End";
                DATE ( YEAR ( UpDown[DOWN_STOP] ); MONTH ( UpDown[DOWN_STOP] ); DAY ( UpDown[DOWN_STOP] ) )
        );
        [Start] <= Date_Selection
            && [End] >= Date_Selection
    )
VAR DateStart =
    IF (
        MINX ( temp_table; UpDown[DOWN_START] ) <= Date_Selection;
        Date_Selection;
        MINX ( temp_table; UpDown[DOWN_START] )
    )
VAR DateEnd =
    IF (
        MAXX ( temp_table; UpDown[DOWN_STOP] ) >= Date_Selection_Next;
        Date_Selection_Next;
        MAXX ( temp_table; UpDown[DOWN_STOP] )
    )
VAR Same_day_selection =
    IF (
        MAXX ( temp_table; [Start] ) = MINX ( temp_table; [End] )
            && MINX ( temp_table; UpDown[DOWN_START] ) >= Date_Selection;
        1
    )
RETURN
    IF (
        DateEnd = BLANK ();
        1440;
        IF (
            Same_day_selection = BLANK ();
            DATEDIFF ( Date_Selection; DateStart; MINUTE )
                + DATEDIFF ( DateEnd; Date_Selection_Next; MINUTE );
            1440
                - CALCULATE (
                    SUM ( UpDown[DOWN_DURATION] );
                    FILTER ( temp_table; UpDown[DOWN_START] = DateStart )
                )
        )
    )

       

      Check result below and attach.

       

      • elietech's avatar
        elietech
        Icon for Helper II rankHelper II
        5 years ago

        Amazing.  Thank you for your help.  This looks to be exactly the solution to my problem.  I really need to level up my skills with DAX apparently.