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I need to union 3 columns and get their sum based on the unification ,then visualise it

I have 3 tables , I want to union 3 columns from them
Table:User COlumn: "Name",
table :CustomerOrders, "CustomerName"
Table: Merchandise,"Name"

I am trying this formula but it is giving me some errors
var customers= UNION(DISTINCT('User'[Name]),DISTINCT(CustomerOrders[CustomerName]))
var selected= UNION(SELECTCOLUMNS('User',"EU",'User'[Name]),SELECTCOLUMNS('CustomerOrders',"Bill",'CustomerOrders'[CustomerName]))
IF (CONTAINS(customers,'User'[Name],SELECTEDVALUE ( 'CustomerOrders'[CustomerName])),
CALCULATE ( [Total Amount], intersect(customers,selected ) )


Then when creating Matrix table, what I should add in the rows to display the unified columns correclty
Super User
Super User


In the Query Editor, rename that column to the same name in all 3 tables.  Then append all three tables and remove all columns other than this column.  Change the case of this column to upper case and remove duplicates.  Create a relationship (Many to One and Single) from the 3 individual tables to this new table.  To your visual, drag Name from the new table.  Now write the measures.

Hope this helps.

Ashish Mathur

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