Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE artist (artist_name VARCHAR, country VARCHAR, rating INTEGER)
TABLE: CREATE TABLE song (artist_name VARCHAR, country VARCHAR, rating INTEGER)

### Question ###
Find the names of the artists who are from Bangladesh and have never received rating higher than 7.

### Accurate SQL ###

SELECT DISTINCT artist_name FROM artist WHERE country = "Bangladesh" EXCEPT SELECT DISTINCT artist_name FROM song WHERE rating > 7