To list column from table mentioned in sub query (MySQL) - mysql

Question

Consider the three tables - actors, roles and movies
mysql> DESCRIBE actors;
+------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | 0 | |
| first_name | varchar(100) | YES | MUL | NULL | |
| last_name | varchar(100) | YES | MUL | NULL | |
| gender | char(1) | YES | | NULL | |
+------------+--------------+------+-----+---------+-------+
4 rows in set (0.17 sec)
mysql> DESCRIBE roles;
+----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| actor_id | int(11) | NO | PRI | NULL | |
| movie_id | int(11) | NO | PRI | NULL | |
| role | varchar(100) | NO | PRI | NULL | |
+----------+--------------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> DESCRIBE movies;
+-----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | 0 | |
| name | varchar(100) | YES | MUL | NULL | |
| year | int(11) | YES | | NULL | |
| rankscore | float | YES | | NULL | |
+-----------+--------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
The following query list the first_name and last_name of all actors acted in movie 'Schindler's List':
mysql> SELECT first_name, last_name FROM actors WHERE id IN
-> (SELECT actor_id FROM roles WHERE movie_id IN
-> (SELECT id FROM movies WHERE name='Schindler\'s List')
-> ) ORDER BY first_name;
Suppose if I want to list the role played by the actors along with their first and last names, what will the best query to fetch the desired result set or output? It may be noted that the role is a column in roles table, which is in the Sub Query.

Answer 1

SELECT DISTINCT a.first_name, a.last_name, r.role
FROM actors a, roles r, movies m
WHERE a.id = r.actor_id and r.movie_id = m.id and m.name='Schindler\'s List'
ORDER BY first_name;
or you can use by joins;
SELECT DISTINCT a.first_name, a.last_name, r.role
FROM roles r
INNER JOIN actors a ON a.id = r.actor_id
INNER JOIN movies m ON r.movie_id = m.id
WHERE m.name='Schindler\'s List'
ORDER BY first_name;