columns and tables

[Anonymous]

hi everyone, 

i have the following table provided.

every material should have a unique material number. If there are more than one material number for a material, a table like  the following table should inform the user

thanks in advance

[Greg_Deckler · Accepted solution]

Perhaps something like:

Measure = 
VAR __table = SUMMARIZE('Table',[Material],[MaterialNumber])
RETURN
COUNTROWS(__table)

[Anonymous]

@Greg_Deckler  Thanks it works!

I am trying to understand the solution. Why does it work. 

Summarize actually return a table with two columns: Material and MaterialNumber.  

So the COUNTROWS( ) function counts the rows of the first column of the VAR __table?

[Greg_Deckler]

Well, it works because SUMMARIZE returns distinct results for each summarized column. So, because you are summarizing by 2 columns, you are essentially going to get back a table with all of the distinct combinations of those two columns. Now, in the context of having material, this means that any material that has 2 material numbers will return 2 rows, because there are 2 unique material numbers for that material. However, if you put this measure in the context of material and material number, I don't think it would work necessarily.

[MattAllington]

Read my blog last week. Towards the end I show you how to do this in Power Query. 

https://exceleratorbi.com.au/preventing-managing-refresh-failures-in-power-bi/