Forum Discussion
DAX
Reading over your whole post i'm thinking this should be done in Power Query instead of dax. Never the less, here is the dax for Q1
Q1: Create a Custom Column:
Status = var thisRecord = [ID] RETURN CALCULATE( COUNTROWS('Table2'), ALL('Table2'), 'Table2'[ID] = thisRecord ) > 0Q2: I really really stress this is going to be a bad idea. The 'Edit Queries' are of Power BI is much better suited to creating tables. Q1 could also be achieved there as well.
Is there a specific reason you want to do this with Dax?
Reading over your whole post i'm thinking this should be done in Power Query instead of dax. Never the less, here is the dax for Q1
Q1: Create a Custom Column:
Status = var thisRecord = [ID]
RETURN
CALCULATE(
COUNTROWS('Table2'),
ALL('Table2'),
'Table2'[ID] = thisRecord
) > 0
Q2: I really really stress this is going to be a bad idea. The 'Edit Queries' are of Power BI is much better suited to creating tables. Q1 could also be achieved there as well.
Is there a specific reason you want to do this with Dax?
Status = var thisRecord = [ID]
RETURN
CALCULATE(
COUNTROWS('Table2'),
ALL('Table2'),
'Table2'[ID] = thisRecord
) > 0
How can we implement this in Power Query?
I haven't got a quick database to test to give you the exact code, but my expectation is that you would do a "Merge Queries" between the 2 tables. This should give you a field that you would expand under normal circumstances. Instead I would attempt using the function List.Count to count how many entries exist in that expandable field.
https://msdn.microsoft.com/en-us/query-bi/m/list-count
If that doesn't work, i'm sure there is another function that will do the count for you. You could then remove the 'merge' column after this to keep your data model small.