Need Distinct Count to ignore one field

[Jas1998]

Hey guys,

So basically my dataset has order data for two markets combined into one. I manually combined them, but they have the same columns etc so it's okay. To distinguish between the two markets I've added a column which says 'Market' either 'England' or 'USA'

The issue is when I do a distinct count on order # to find out unique orders. Looks like both the markets have some similar Order IDs which causes an issue as distinct count would not count it as two, but as one. Is there any way past this or will I need to create two seperate views? Can I get a distinct count which sort of ignores duplicates ONLY if that duplicate belongs to another market?

[amitchandak · Accepted solution]

@Jas1998 , Based on what I got, A new measure

countrows(Summarize(Table, Table[Market], Table[Order ID]) )

[Jas1998]

Wow, thank you so much. Worked. 

Can you take a minute to explain the logic to me? And how do I get a grip of these advanced formulas? I've only done a beginner course.