Task: Text to Code
Input (English): Step 1: find without repetition the artist_name of song table.
Step 2: find the artist_name of song table for which rating greater than 8.
Step 3: show the rows that are in the results of step 1 but not in the results of step 2
Output (English): SELECT DISTINCT artist_name FROM song EXCEPT SELECT artist_name FROM song WHERE rating > 8