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pdc Frequent Visitor
Frequent Visitor

link fact tables

 

Hi,

 

Nooby with DAX/PowerBI. In SQL I know how to do, but I could not figure out how to do in Power BI desktop. In the screenshot from Excel I explain what I will achieve. Also the steps I see what are needed for the calculation.

 

The point is that [c dim] is not in the pivot table. Therefore a SUMX does not have the correct context. [c dim] must be added in the calculation in order to calculate the correct amount in the pivot table.

issue.png

 

Hope anyone can help!

Thanks in advance.

 

 

3 REPLIES 3
Moderator v-yuezhe-msft
Moderator

Re: link fact tables

Hi @pdc

Based on your current sample data, you can create a new table using the following formula.

Newtable = ADDCOLUMNS('C dimension',"v1",LOOKUPVALUE(FACT1[v1],FACT1[c dim],'C dimension'[c-dim]),"a dim",LOOKUPVALUE(FACT1[a dim],FACT1[c dim],'C dimension'[c-dim]))

Then create relationship between new table and FACT2 table using c dim field, and create a new column in the newly created table using formula below.

Column = 'Newtable'[v1]*RELATED(FACT2[v2])

This way, you can create a table visual as follows.
1.PNG

For more details about the above steps, please review this attached PBIX file.

Thanks,
Lydia Zhang

Community Support Team _ Lydia Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
pdc Frequent Visitor
Frequent Visitor

Re: link fact tables

Hi Lydia,

 

Many thanks for your reply. I understand your solution. But I don't think this will solve my issue yet. If I'm correct the creation of Newtable is a static table during slice. This Newtable is refreshed during source data refresh. I need a dynamic table. I will explain why.

 

Based on your reply I understood my issue definition must be better. So I made a new screenshot, see below.

I added the g dim and r dim.

r dim was added because of a slicer, that excludes R1

g dim was added to show that v1 can be split into two values. Because there are a lot of records a summarize is required.

 

Does anyone have a solution? Many thanks in advance!

 

screenshot issue fact tables new.png

 

Moderator v-yuezhe-msft
Moderator

Re: link fact tables

Hi @pdc,

In this sceanrio,  you would need to create another table using the following formula.
Table = SUMMARIZE(FACT1,FACT1[a dim],FACT1[c dim],"v1",sum(FACT1[v1]))

Then create another new table based on the above table.

Newtable = ADDCOLUMNS('C dimension',"v1",LOOKUPVALUE('Table'[v1],'Table'[c dim],'C dimension'[c-dim]),"a dim",LOOKUPVALUE('Table'[a dim],'Table'[c dim],'C dimension'[c-dim]))

Please review modified PBIX file.

Thanks,
Lydia Zhang

Community Support Team _ Lydia Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.