What columns can be used in OUTPUT INTO clause?

Question

I\'m trying to build a mapping table to associate the IDs of new rows in a table with those that they\'re copied from. The OUTPUT INTO clause seems perfect for that, but it does

Answer 1

(MS) If the table being modified is also specified in the FROM clause, any reference to columns in that table must be qualified with the INSERTED or DELETED prefix.

In your example, you can't use cglobal table in the OUTPUT unless it's INSERTED.column_name or DELETED.column_name:

INSERT INTO Private.Content 
    (Tag) 
    OUTPUT cglobal.ContentID, INSERTED.ContentID 
    INTO @Inserted (SrcContentID, TgtContentID)
SELECT Tag
    FROM Private.Content AS cglobal
    INNER JOIN @Missing AS m ON cglobal.ContentID = m.SrcContentID

What worked for me was a simple alias table, like this:

INSERT INTO con1 
    (Tag) 
    OUTPUT **con2**.ContentID, INSERTED.ContentID 
    INTO @Inserted (SrcContentID, TgtContentID)
SELECT Tag
    FROM Private.Content con1
    **INNER JOIN Private.Content con2 ON con1.id=con2.id**
    INNER JOIN @Missing AS m ON con1.ContentID = m.SrcContentID