cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
msprog
Frequent Visitor

RELATEDTABLE and distinct

HI,
I need some help here.

I have a simple powerbi model with 2 tables, Product and Sales.

 

The Sales table has fields: OrderNo, LineNo, ProductKey , Qty, etc
The Product table has ProductKey, ProductName, Description.

There is a 1 to Many relationship between Product and Sales table.

 

Now, On the Product table, in powerBI, i want to have a calculated Column called NumberofOrders.
NumberofOrders is the distinct count orders in which the product has been sold. Remeber a Product may appear more than one line items within an order, hence only the distinct count of orders.

 

How can i achieve this? I know we need to use RELATEDTABLE.

I am trying something like

=COUNTROWS(distinct(RELATEDTABLE(FactInternetSales)))

but this doesn't work/

Hww do i use a distinct in this case?
Please help
thanks

1 ACCEPTED SOLUTION
vik0810
Resolver V
Resolver V

Hi @msprog,

 

you can use following DAX:

 

NumberOfOrders = CALCULATE(DISTINCTCOUNT(sales[OrderNo]), RELATEDTABLE(sales))

View solution in original post

2 REPLIES 2
vik0810
Resolver V
Resolver V

Hi @msprog,

 

you can use following DAX:

 

NumberOfOrders = CALCULATE(DISTINCTCOUNT(sales[OrderNo]), RELATEDTABLE(sales))

View solution in original post

msprog
Frequent Visitor

Hi @vik0810

I have a followup question on this if it is ok. 

 

NumberOfOrders = CALCULATE(DISTINCTCOUNT(sales[OrderNo]), RELATEDTABLE(sales))

The solution works fine but as i am reading more about PowerBI , a question arose  on the use of RelatedTable function in this solution, which i am hoping the  you/community can help clarify.  I am wondering why the below code is not working:

 

NumberOfOrders = CALCULATE(DISTINCTCOUNT(sales[OrderNo]), sales)

 

why do we need the RelatedTable when we are using Calculate?

 

THis is my thinking:

I read that the Calculate function converts Row into a filter context and the filter context filters the whole model based on the realtionships.  So we have a 1 to many relationship between Product and Sales.  we are creating a calculated column in Product.  So there is a row context.  Now the use of Calculate should convert the row context into filter, which means the Sales table should get filtered, automatically?  Please help clarify

 

thanks

 

 

 

 

Helpful resources

Announcements
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