SQL exercises on movie Database: Find the titles of all movies directed by James Cameron

SQL movie Database: Subquery Exercise-15 with Solution

15. From the following tables, write a SQL query to find the movies directed by 'James Cameron'. Return movie title.

Sample table: director

Sample table: movie_direction

Sample table: movie

Sample Solution:

SELECT mov_title
FROM movie
WHERE mov_id IN (
SELECT mov_id 
FROM movie_direction 
WHERE dir_id IN (
SELECT dir_id 
FROM director 
WHERE dir_fname = 'James' AND dir_lname='Cameron'
));

OR

SELECT mov_title FROM movie 
JOIN  movie_direction 
 ON movie.mov_id=movie_direction.mov_id
JOIN  director 
 ON movie_direction.dir_id=director.dir_id
WHERE dir_fname = 'James' AND dir_lname='Cameron';

Sample Output:

                     mov_title
----------------------------------------------------
 Titanic
 Aliens
(2 rows)

Code Explanation:

The said query in SQL that selects the dir_id of the director named James Cameron from the director table, and then selects the mov_id of all movies directed by James Cameron from the movie_direction table. Finally, the query selects the title of each of those movies from the movie table.
The subquery is used to find the director ID for James Cameron, and then uses another subquery to find all movies directed by him based on the director ID. Then the outer most query retrieves the titles of all those movies from the movie table.

Relational Algebra Expression:

Relational Algebra Tree:

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