Task: Text to Code
Input (English): Step 1: find the architect_id of mill table.
Step 2: find without repetition the architect's name, nationality of architect table whose architect's id not one of the results of step 1
Output (English): SELECT DISTINCT T1.name , T1.nationality FROM architect AS T1 WHERE T1.id NOT IN ( SELECT T2.architect_id FROM mill AS T2 )