Get last available value from previous dates if it's empty

[szymakat]

Hello, 
would anyone have an idea how to fetch lastest available value if for certain date is null? 
I'd need to repeat 476.62 for days with no result. 
If on some point it changes to 500 and next days have nulls - i want to populate 500 then, up till today. 

Thanks so much for your time!

[v-tejrama · Accepted solution]

Hi @szymakat ,

Thanks for reaching out to the Microsoft fabric community forum.

You can efficiently address the issue of filling null values in Power BI by using DAX. Suppose your table includes date_c, project, and scope_km columns, and some scope_km values are blank. To forward-fill the last known value until a new one appears, follow these steps:

Start by entering your data in Power BI, including sample dates, project names (e.g., UNY_NYC_Manhattan), and scope_km values such as 476.62 and 500, with blanks in between. After loading the data, switch to “Data” view and create a new column with this DAX formula:

ValueWithPrevious =
VAR CurrentDate = ProjectData[date_c]
VAR CurrentProject = ProjectData[project]
RETURN
CALCULATE(
   MAX(ProjectData[scope_km]),
   FILTER(
       ProjectData,
       ProjectData[project] = CurrentProject &&
       ProjectData[date_c] <= CurrentDate &&
       NOT(ISBLANK(ProjectData[scope_km]))
   )
)

This formula dynamically retrieves the most recent non-blank value for each project up to the current date. After creating the column, add date_c, project, scope_km, and the new ValueWithPrevious column to your table visual. This method ensures all nulls are accurately forward-filled.

Please find the attached pbix and screenshort file for your reference.

Best Regards,
Tejaswi.
Community Support

[szymakat]

This works perfectly! Thank you so much for your effort.

[FBergamaschi]

Please include, in a usable format, not an image, a small set of rows for each of the tables involved in your request and show the data model in a picture, so that we can import the tables in Power BI and reproduce the data model. The subset of rows you provide, even is just a subset of the original tables, must cover your issue or question completely. Do not include sensitive information and do not include anything that is unrelated to the issue or question. 

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Francesco Bergamaschi

MBA, M.Eng, M.Econ, Professor of BI