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LeeI's avatar
LeeI
Frequent Visitor
2 years ago
Solved

question about using PreviousDay function

I have a simple measure that is supposed to return the previous days number for a count of apps that meet a certain criteria. At first, I tried this dax expression: 

 

Apps previous day = Calculate(

                                                  count(data[app Number]), Previousday(date DIM [Date]))

 

This expression does not return an error, but it also does not return any values. I was able to get the measure to work properly by using:

 

Apps Previous Day =
CALCULATE(
    COUNT(Data[app Number]),
    FILTER(
        ALL('Date DIM'),
        'Date DIM'[Date] = Today() -1
    )
       
)
 
However, I am confused why the first dax expression does not work. Especially since Microsoft's publishing of the previousday function seems to imply that it should. 
 
 
Would anyone be able to help me understand why the first dax expression does not seem to be working properly? 
 
Thanks, 

 

 

"DAX "
PREVIOUSDAY
  • bhanu_gautam's avatar
    bhanu_gautam
    2 years ago

    LeeI  , The PREVIOUSDAY function is a time intelligence function that works with a date column to return a table containing the previous day. However, it requires a proper date context to function correctly.

     

    Try using ALL function to remove any existing filter on dim[date]

     

    Apps previous day =
    CALCULATE(
    COUNT(data[app Number]),
    PREVIOUSDAY(ALL('Date DIM'[Date]))
    )

     

1 Reply

  • bhanu_gautam's avatar
    bhanu_gautam
    Super User
    2 years ago

    LeeI  , The PREVIOUSDAY function is a time intelligence function that works with a date column to return a table containing the previous day. However, it requires a proper date context to function correctly.

     

    Try using ALL function to remove any existing filter on dim[date]

     

    Apps previous day =
    CALCULATE(
    COUNT(data[app Number]),
    PREVIOUSDAY(ALL('Date DIM'[Date]))
    )