What movie title has the highest rating? | Do you mean the title of the movie with the highest stars? | Yes
SELECT T2.title  FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID   =   T2.mID GROUP BY T1.mID ORDER BY T1.stars DESC LIMIT 1
highest rating refers to MAX(rating.stars); movie title with the highest rating requires joining Rating and Movie tables on movie ID;