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

What are the movie titles with the highest average rating and what are those ratings?
SELECT T2.title, AVG(T1.stars) FROM rating AS T1 JOIN movie AS T2 ON T1.mid = T2.mid GROUP BY T1.mid ORDER BY AVG(T1.stars) DESC LIMIT 1
SELECT "T2"."title", AVG("T1"."stars") FROM "rating" AS "T1" JOIN "movie" AS "T2" ON "T1"."mid" = "T2"."mid" GROUP BY "T1"."mid" ORDER BY AVG("T1"."stars") DESC NULLS LAST LIMIT 1