Hi @jzhao ,
The reason for the error in your second code is that you are using the VALUES function instead of the DISTINCT function to return a table of unique rows. The VALUES function returns a one-column table that contains the distinct values from the specified column, optionally ignoring any blank values. However, in your case, you are passing a table expression to the VALUES function, which is not a valid argument. The VALUES function expects a column reference as its input parameter.
The DISTINCT function, on the other hand, returns a table by removing duplicate rows from another table or expression. The DISTINCT function can take any table expression as its input parameter, and it will return a table with the same columns and only distinct rows.
Therefore, to fix your error, you need to replace the VALUES function with the DISTINCT function in your second code, as you did in your first code. This will ensure that you are passing a valid table expression to the FILTER function, and that you are getting a table of unique rows from three different columns in three different tables.
Solved: Find and Replace values either by a measure and or... - Microsoft Fabric Community
DISTINCT (table) function (DAX) - DAX | Microsoft Learn
powerbi - DAX Query to Get Distinct Items from Multiple Tables - Stack Overflow
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