SQL exercises on movie Database: Find the movie title, and the highest number of stars that movie received

SQL movie Database: Subquery Exercise-11 with Solution

11. From the following tables, write a SQL query to find those movies, which have received highest number of stars. Group the result set on movie title and sorts the result-set in ascending order by movie title. Return movie title and maximum number of review stars.

Sample table: rating

Sample table: movie

Sample Solution:

SELECT mov_title, MAX(rev_stars)
FROM movie, rating 
WHERE movie.mov_id=rating.mov_id 
AND rating.rev_stars IS NOT NULL
GROUP BY  mov_title
ORDER BY mov_title;

Sample Output:

                     mov_title                      | max
----------------------------------------------------+------
 Aliens                                             | 8.40
 American Beauty                                    | 7.00
 Annie Hall                                         | 8.10
 Avatar                                             | 7.30
 Beyond the Sea                                     | 6.70
 Blade Runner                                       | 8.20
 Boogie Nights                                      | 3.00
 Braveheart                                         | 7.70
 Donnie Darko                                       | 8.10
 Good Will Hunting                                  | 4.00
 Lawrence of Arabia                                 | 8.30
 Princess Mononoke                                  | 8.40
 Slumdog Millionaire                                | 8.00
 The Innocents                                      | 7.90
 The Usual Suspects                                 | 8.60
 Titanic                                            | 7.70
 Vertigo                                            | 8.40
(17 rows)

Code Explanation:

The said query in SQL that retrieves the movie titles along with the maximum rating stars for each movie, where the ratings are not null. The results are sorted in alphabetical order based on the movie titles.
The query joins the movie and rating tables using the mov_id column, then applies a filter to exclude any rows where the rev_stars column is null. The MAX function is used to retrieve the highest rating value for each movie title, and the GROUP BY clause is used to group the results by mov_title. The ORDER BY clause sorts the results in alphabetical order based on mov_title.

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Query Visualization:

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Previous: From the following tables, write a SQL query to find those reviewers who rated more than one movie. Group the result set on reviewer’s name, movie title. Return reviewer’s name, movie title.
Next: From the following tables, write a SQL query to find all reviewers who rated the movie ‘American Beauty’. Return reviewer name.