Check if a value exists between many-to-tables in Direct Query

[RYU209]

Hello,

I have two Direct Query tables with a Many-To-Many relationship (Table1 and Table2). They are connected by a key that is made up of a concatenated Transaction # and Order #. 

I have a Table Visual that holds records of Transaction, Order, and some other data elements from Table2. How can I create a measure filter that filters this visual to only show records that have a concatenated key that also exists in Table1? 

[johnt75 · Accepted solution]

You could create a measure like

Value is in Table1 =
VAR CurrentKey =
    SELECTEDVALUE ( 'Table2'[concatenated key] )
RETURN
    IF ( CurrentKey IN ALL ( 'Table1'[concatenated key] ), 1 )

and then use that as a visual level filter to only show when the value is 1

[RYU209]

@johnt75 That worked perfectly! 

Could you explain what IN and ALL are doing so I can understand how it works? 

[johnt75]

ALL returns all the values of Table 1 key regardless of any filters which may be applied, including any filters from the many-to-many relationship.

IN then checks to see whether the current key exists in those values.

[RYU209]

@johnt75 Thank you!