SQL exercises on movie Database: Find the movie title, year, date of release, director and actor for those movies which reviewer is unknown

SQL movie Database: Subquery Exercise-4 with Solution

4. From the following tables, write a SQL query to find for movies whose reviewer is unknown. Return movie title, year, release date, director first name, last name, actor first name, last name.

Sample table: movie

Sample table: actor

Sample table: director

Sample table: movie_direction

Sample table: movie_cast

Sample table: reviewer

Sample table: rating

Sample Solution:

SELECT mov_title, mov_year, mov_dt_rel, dir_fname, dir_lname, 
       act_fname, act_lname
	   FROM movie a, movie_direction b, director c, 
                rating d, reviewer e, actor f, movie_cast g
	   WHERE a.mov_id=b.mov_id
AND  b.dir_id=c.dir_id 
 AND a.mov_id=d.mov_id 
  AND  d.rev_id=e.rev_id 
   AND  a.mov_id=g.mov_id 
    AND g.act_id=f.act_id 
	 AND e.rev_name IS NULL;

Sample Output:

                     mov_title                      | mov_year | mov_dt_rel |      dir_fname       |      dir_lname       |      act_fname       |      act_lname
----------------------------------------------------+----------+------------+----------------------+----------------------+----------------------+----------------------
 Blade Runner                                       |     1982 | 1982-09-09 | Ridley               | Scott                | Harrison             | Ford
 Princess Mononoke                                  |     1997 | 2001-10-19 | Hayao                | Miyazaki             | Claire              | Danes
(2 rows)

Code Explanation:

The said query in SQL that selects various information about movies, directors, actors, and reviewers
from several tables in the movie database, but only for movies that have not been reviewed.
This query retrieve columns movie title, year,
date of release, director first and last names, actor first and last names from the tables join together are 'movie', 'movie_direction', 'director', 'rating', 'reviewer', 'actor', and 'movie_cast'.
The JOIN clause joins the 'movie' and 'movie_direction' table on "mov_id" column the 'movie_direction' and 'director' tables on "dir_id" column, the 'movie' and 'rating' tables on "mov_id" column, the 'rating' and 'reviewer' tables on "rev_id" column the 'movie' and 'movie_cast' tables on "mov_id" column , the 'movie_cast' and 'actor' tables on "act_id" column, and the "rev_name" column in 'reviewer' must be NULL (i.e., the movie has not been reviewed).

Relational Algebra Expression:

Relational Algebra Tree:

Practice Online

Query Visualization:

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