CREATE TABLE movie (mid NUMBER, title CLOB, year NUMBER, director CLOB)
CREATE TABLE reviewer (rid NUMBER, name CLOB)
CREATE TABLE rating (rid NUMBER, mid NUMBER, stars NUMBER, ratingdate TIME)

What are the ids of all reviewers who have not given 4 stars at least once?
SELECT rid FROM rating WHERE stars <> 4
SELECT "rid" FROM "rating" WHERE "stars" <> 4