Create movie-rating.sql

Author: kamyu104

MySQL/movie-rating.sql

@@ -0,0 +1,28 @@
+# Time:  O(nlogn), n is the number of movie_rating
+# Space: O(n)
+
+(SELECT b.name AS results 
+ FROM   (SELECT a.user_id, 
+                Count(*) AS cnt 
+         FROM   movie_rating a 
+         GROUP  BY a.user_id) a 
+        INNER JOIN users b 
+               ON a.user_id = b.user_id 
+ ORDER  BY a.cnt DESC, 
+           b.name ASC 
+ LIMIT  1) 
+UNION ALL 
+(SELECT b.movie_name 
+ FROM   (SELECT a.movie_name, 
+                Avg(a.rating) AS max_rating 
+         FROM   (SELECT a.rating,
+                        b.title AS movie_name 
+                 FROM   movie_rating a 
+                        INNER JOIN movies b 
+                                ON a.movie_id = b.movie_id 
+                 WHERE  a.created_at BETWEEN '2020-02-01' AND '2020-02-29') a 
+         GROUP  BY a.movie_name) b 
+ ORDER  BY b.max_rating DESC, 
+           b.movie_name ASC 
+ LIMIT  1); 
+