What are the names of the different artists that have produced a song in English but have never receieved a rating higher than 8?
SELECT DISTINCT artist_name FROM song WHERE languages  =  "english" EXCEPT SELECT DISTINCT artist_name FROM song WHERE rating  >  8
produced a song in English refers to languages = 'english'; never received a rating higher than 8 refers to rating <= 8; names of the different artists refers to DISTINCT artist_name;