SQL exercises on movie Database: Find the first and last name of all the directors with number of genres movies they directed with genres name, and arranged the result alphabetically with the first and last name of the director

SQL movie Database: Join Exercise-6 with Solution

6. From the following tables, write a SQL query to find the directors with number of genres movies. Group the result set on director first name, last name and generic title. Sort the result-set in ascending order by director first name and last name. Return director first name, last name and number of genres movies.

Sample table: director

Sample table: movie_direction

Sample table: genres

Sample table: movie_genres

Sample Solution:

SELECT dir_fname,dir_lname, gen_title,count(gen_title)
FROM director
NATURAL JOIN movie_direction
NATURAL JOIN movie_genres
NATURAL JOIN genres
GROUP BY dir_fname, dir_lname,gen_title
ORDER BY dir_fname,dir_lname;

Sample Output:

      dir_fname       |      dir_lname       |      gen_title       | count
----------------------+----------------------+----------------------+-------
 Alfred               | Hitchcock            | Mystery              |    1
 Bryan                | Singer               | Crime                |    1
 Danny                | Boyle                | Drama                |    2
 David                | Lean                 | Adventure            |    1
 Frank                | Darabont             | Crime                |    1
 Hayao                | Miyazaki             | Animation            |    1
 Jack                 | Clayton              | Horror               |    1
 James                | Cameron              | Action               |    1
 John                 | Boorman              | Adventure            |    1
 Kevin                | Spacey               | Music                |    1
 Michael              | Cimino               | War                  |    1
 Ridley               | Scott                | Thriller             |    1
 Sam                  | Mendes               | Romance              |    1
 Stanley              | Kubrick              | Mystery              |    1
 Woody                | Allen                | Comedy               |    1
(15 rows)

Relational Algebra Expression:

Relational Algebra Tree:

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Query Visualization:

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