SQL exercises on movie Database: Find the actors with all information who played a role in the movie 'Annie Hall'

SQL movie Database: Subquery Exercise-1 with Solution

1. From the following tables, write a SQL query to find the actors who played a role in the movie 'Annie Hall'. Return all the fields of actor table.

Sample table: actor

Sample table: movie_cast

Sample table: movie

Sample Solution:

SELECT * 
FROM actor 
WHERE act_id IN(
SELECT act_id 
FROM movie_cast 
WHERE mov_id IN (
SELECT mov_id 
FROM movie 
WHERE mov_title='Annie Hall'
));

Sample Output:

 act_id |      act_fname       |      act_lname       | act_gender
--------+----------------------+----------------------+------------
    111 | Woody                | Allen                | M
(1 row)

Code Explanation:

The query in SQL that retrieves all information on actors who appeared in the movie 'Annie Hall'. The query uses a subquery to find the mov_id of the movie 'Annie Hall', and then searches the movie_cast table to find all actors who appeared in that movie by matching the mov_id to the inner subquery.
The outer query returns all information on the actors found in the previous step, by matching their act_id values to those in the actor table.

Relational Algebra Expression:

Relational Algebra Tree:

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Query Visualization:

Duration:

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Cost:

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