getting aggregate functions then using them

Question

im probably gonna have difficulty explaining my exact problem but im using an aggregate function to get the average rating of movies but then i dont know how to use that and then list the movies which have a rating less than that i have tried this with a union query first and this didnt work so now im trying it with an implicit join and this is what i have:

SELECT
FROM MOVIE
WHERE RATING = (SELECT AVG (RATING) AS avg_rating
                FROM MOVIE
                WHERE RATING = (SELECT RATING 
                                FROM MOVIE
                                WHERE RATING < avg_rating));

i just seem to be going in circles here thanks in advance!

Answer 1

这是我在Access中所做的：

SELECT *
FROM MOVIE
WHERE (((MOVIE.[RATING])<(SELECT AVG (RATING) AS avg_rating from Movie)));