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?
Solved! Go to Solution.
If you want to understand the reason behind that answer, check this out: http://www.powerpivotpro.com/2009/12/powerpivot-dax-calculate-is-a-supercharged-sumif/
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.
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