Calculate date specific measure with another table's dates.

[Anonymous]

Apologies if I have missed a forum post on this question.

I have a a calendar dates table dim_dates linked to a fact table fct_amt on the date field.

• dim_dates has every date
• fct_amt only contains dates with values against them
  
  • ie. Weekends are generally not in the table as the amounts are weekday based
• The two tables share a many to one relationship (on the left is dim_dates).

I am reporting on a matrix visualisation with the following:

• 'dim_dates'[dates] on Rows
• 'fct_amt'[amount] on Values
• I also have a slicer set to 'fct_amt '[dates]'.

I would like to calculate a SUM based on 'fct_amt'[amount]' such that:

1. If 'fct_amt'[dates] is not blank then SUM all the 'fct_amt'[amount]' for the current row's  'fct_amt'[dates] 
2. If 'fct_amt'[dates] is blank then SUM all the 'fct_amt'[amount]' for the next available 'fct_amt'[dates]

My current attempt at this measure is the following:

1. Retrieve the closest available 'fct_amt'[dates] for the current 'dim_dates'[dates] (such that 'fct_amt'[dates]>='dim_dates'[dates])
2. SUM 'fct_amt'[amount]' for 'fct_amt'[dates] that matches step 1

I've got step 1 down and validated this by creating a measure based on the logic and it correctly shows the next available 'fct_amt'[dates] if 'fct_amt'[dates] is blank. 

Now I've tried setting the slicer onto a date where 'fct_amt[dates]' is blank and have tried the following to no avail:

CALCULATE(SUM('fct_amt'[amount]),FILTER(ALL('fct_amt'[dates]),'fct_amt'[dates]=DateFromStep1)).

What step/s am I missing from my calculation?

[Ashish_Mathur]

Hi,

Share some data and show the expected result.

[Anonymous]

Hi Ashish, dummy pbix: https://drive.google.com/open?id=12jHWSy1D4d-Bts1WgmLippBzHd_V9Qjg

Desired results as per ss below:

[Anonymous · Accepted solution]

The following DAX has worked for my desired solution though am unsure of the efficiency of it.

amount_sum = 
VAR ClosestAvailableDate =
CALCULATE(
    FIRSTDATE('dim_dates'[date])
    ,FILTER(
        ALLSELECTED('dim_dates'[date]),'dim_dates'[date]=
                                CALCULATE(FIRSTDATE('fct_amount'[date])
                                ,FILTER(ALL('fct_amount'[date]),'fct_amount'[date]>=MAX('dim_dates'[date])))
    ))

RETURN
CALCULATE(SUMX(FILTER('fct_amount','fct_amount'[date]=ClosestAvailableDate),'fct_amount'[amount]),ALL('fct_amount'))