Question

How to ensure your DAX measure includes all date values during filtering?
I’m working on a DAX measure that should include all dates, but during filtering, some dates are excluded. I need guidance on how to adjust my DAX formula or the model so that all date values are included in the calculation, even if no data exists for some dates.

Answer 1

To ensure your DAX measure includes all date values during filtering, even when no data exists for some dates, you can use the following approaches:

1. Use ALL or ALLSELECTED in the measure:

   • The ALL function removes any filters from the date table, ensuring all dates are included in the calculation. This is useful when you want to include all dates regardless of slicer filters.

   • The ALLSELECTED function preserves filters that are explicitly selected by the user while ignoring other filters, which may help retain slicer selections.

   Example:

Total Sales = 
CALCULATE(
   SUM(Sales[Amount]),
   ALL('Date'[Date])
)

• This ensures all dates from the 'Date' table are considered, even if there’s no data for some of those dates.

• Ensure the Date Table is Properly Linked:

  • Make sure that your Date table is correctly related to the fact table in the model. A properly related Date table ensures that all date values are considered, even if there’s no data for some of the dates.

• Use COALESCE to Handle Missing Data:

  • When calculating a measure, use COALESCE to ensure that even missing values are included, returning a default value (like 0) for those dates with no data.

  Example:

Total Sales = 
COALESCE(
   CALCULATE(SUM(Sales[Amount]), 'Date'[Date]),
   0
)

This ensures that missing values are treated as zero, keeping all dates in the result.