Showing results for 
Search instead for 
Did you mean: 
Regular Visitor

Generate Missing Data via Script

Hi, Im starting to use Power BI I came from QlikView. I want to know if in Power Desktop I can generate data via script, for example I have some uses cases.


1- Fill data from-to date


I have in my DB a entry


Id - From     -      To

a    1/1/2016       1/5/2016

b    1/1/2016       1/2/2016



Result wanted in Power BI:


Id - Date     

a    1/1/2016

a    1/2/2016 

a    1/3/2016

a    1/4/2016 

a    1/5/2016 

b    1/1/2016

b    1/2/2016




2- Fill the gaps between dates.


I have an exchange rate table


Date      -    Exchange Rate

1/1/2016     9,716    

1/5/2016     9,801

1/7/2016     10,01


Result wanted:


Date      -    Exchange Rate

1/1/2016     9,716    

1/2/2016     9,716

1/3/2016     9,716

1/4/2016     9,716

1/5/2016     9,801

1/6/2016     9,801

1/7/2016     10,01


Can some1 in first place tell me if this is posible via Script in Power BI. And if trully can be made pls tell me how and provide documentation about how to create custom loads.




Power BI Team
Power BI Team

For generating a table of dates, take a look at the CALENDARAUTO() DAX function. This creates a Calculated Table across all the date range in your model.


Then you can add a column to that table that pulls the relevant Exchange Rate for the dates that have a value.


You could fill in the remaining Exchange Rate values by using the a DAX calculation like this:


FullExchangeRate =


   LASTNONBLANK(Query1[Exchange Rate], TRUE()) ,





                  ) ,

                  ALL(Query1)) ,




There might be a more efficient way to do that, but it'll work!

Responsive Resident
Responsive Resident

Instead of duplicating your data maybe you can try searching for a solution based on slowly changing dimensions. there are several ways to approach this. Here's one example in the following link

Business Intelligence Architect / Consultant

Helpful resources

MBAS on Demand

2021 Release Wave 2 Plan

Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.

July 2021 Update 768x460.png

Check it out!

Click here to read more about the July 2021 Updates

Power Query PA Forum 768x460.png

Check it out!

Did you know that you can visit the Power Query Forum in Power BI and now Power Apps

Top Solution Authors
Top Kudoed Authors