SELECT mID ,  avg(stars) FROM Rating WHERE mID NOT IN (SELECT T1.mID FROM Rating AS T1 JOIN Reviewer AS T2 ON T1.rID  =  T2.rID WHERE T2.name  =  "Brittany Harris") GROUP BY mID
Find the average rating star for each movie that are not reviewed by Brittany Harris.
[Schema (values) (types)]: | movie_1 |  Movie : mid (text) , title (number) , year (text) , director (number) | Reviewer : rid (text) , name (number) | Rating : rid (text) , mid (number) , stars (text) , ratingdate (number);