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

What are the names of all directors who made one movie?
SELECT director FROM movie GROUP BY director HAVING COUNT(*) = 1
SELECT "director" FROM "movie" GROUP BY "director" HAVING COUNT(*) = 1