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DistinctCount IF?

Hi All,


I'm new to Power BI (and DAX) coming from Tableau.


I've got a question regarding the DiscountCount function.


I need to calculate a percentage of orders that include a certain item. The way my data is structured is line items on every order for the last year. (Example: If one order has three items on it, three lines are returned for that order each line with a specific item).


I'd like to create a measure that give me the sum of a distinct count of order numbers but only if they include a certain item number. I can't use the filter function because I'd need to compare the afore mentioned measure to a count of all distinct orders.


This seems like something that should be very doable, I'm just can't wrap my head around it yet.




PS - Does anyone have any good resources (perferably books) that can get me into the swing of using DAX and Power BI?

Resident Rockstar
Resident Rockstar

    DISTINCTCOUNT( FactOrder[OrderNumber] )
    ,FactOrder[Line Item] = <certein item number>

View solution in original post

Resident Rockstar
Resident Rockstar

    DISTINCTCOUNT( FactOrder[OrderNumber] )
    ,FactOrder[Line Item] = <certein item number>

@greggyb  @KHorseman  I am trying to use your formula, but i am not sure where I am doing a mistake 


want to calculate distinct job number on gloss pack option or body colour option 



Here is the error 




@greggyb  Can you please tell me where i am doing wrong, I tried to use your formula 




Not applicable

Worked perfectly! Thank you so much!

If you want to understand the reason behind that answer, check this out:


Actually the title of that blog post is slightly misleading; CALCULATE is a supercharged WHATEVERIF. COUNTIF, SUMIF, DIVIDEIF, etc. depending on what kind of expression you feed into it. That whole blog is a fantastic resource for learning DAX, and they've got a great book as well.

Did I answer your question? Mark my post as a solution!

Proud to be a Super User!

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Thank for the resource, I really appreciate it!

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