SQL Subqueries Lab

lab-sql-subqueries.sql

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+-- Write SQL queries to perform the following tasks using the Sakila database:
+USE sakila;
+
+-- 1. Determine the number of copies of the film "Hunchback Impossible" that exist in the inventory system.
+SELECT 
+    COUNT(title)
+FROM
+    inventory AS i
+        JOIN
+    film AS f ON f.film_id = i.film_id
+WHERE
+    title = 'Hunchback Impossible';
+
+-- 2. List all films whose length is longer than the average length of all the films in the Sakila database.
+SELECT * FROM film 
+WHERE length > (SELECT AVG(length) FROM film);
+
+-- 3. Use a subquery to display all actors who appear in the film "Alone Trip".
+SELECT * FROM actor;
+SELECT * FROM film_actor;
+
+SELECT 
+    a.first_name, a.last_name, f.title
+FROM
+    actor AS a
+        JOIN
+    film_actor AS fa ON a.actor_id = fa.actor_id
+        JOIN
+    film AS f ON fa.film_id = f.film_id
+WHERE
+    f.film_id IN (SELECT 
+            film_id
+        FROM
+            film
+        WHERE
+            title = 'Alone Trip');
+
+-- 4. Sales have been lagging among young families, and you want to target family movies for a promotion. Identify all movies categorized as family films.
+
+SELECT 
+    f.title, c.name
+FROM
+    film AS f
+        JOIN
+    film_category AS fc ON f.film_id = fc.film_id
+        JOIN
+    category AS c ON c.category_id = fc.category_id
+WHERE
+    name = 'Family';
+
+-- 5. Retrieve the name and email of customers from Canada using both subqueries and joins. To use joins, you will need to identify the relevant tables and their primary and foreign keys.
+
+SELECT 
+    CONCAT(c.first_name, ' ', c.last_name) AS full_name, c.email
+FROM
+    customer AS c
+        JOIN
+    address AS a ON c.address_id = a.address_id
+        JOIN
+    city AS ci ON a.city_id = ci.city_id
+WHERE
+    ci.country_id IN (SELECT 
+            co.country_id
+        FROM
+            country AS co
+        WHERE
+            co.country = 'Canada');
+
+-- 6. Determine which films were starred by the most prolific actor in the Sakila database. A prolific actor is defined as the actor who has acted in the most number of films. First, you will need to find the most prolific actor and then use that actor_id to find the different films that he or she starred in.
+SELECT 
+    f.title
+FROM
+    film AS f
+        JOIN
+    film_actor AS fa ON f.film_id = fa.film_id
+WHERE
+    fa.actor_id = (SELECT 
+            actor_id
+        FROM
+            film_actor
+        GROUP BY actor_id
+        ORDER BY COUNT(*) DESC
+        LIMIT 1);
+
+