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SQL SUBQUERIES/1.sql

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+SELECT COUNT(*) AS total_copies
+FROM inventory i
+JOIN film f ON i.film_id = f.film_id
+WHERE f.title = 'Hunchback Impossible';

SQL SUBQUERIES/2.sql

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+SELECT title, length
+FROM film
+WHERE length > (SELECT AVG(length) FROM film);

SQL SUBQUERIES/3.sql

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+SELECT a.actor_id, a.first_name, a.last_name
+FROM actor a
+WHERE a.actor_id IN (
+    SELECT fa.actor_id
+    FROM film_actor fa
+    JOIN film f ON fa.film_id = f.film_id
+    WHERE f.title = 'Alone Trip'
+);

SQL SUBQUERIES/4.sql

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+SELECT f.title
+FROM film f
+JOIN film_category fc ON f.film_id = fc.film_id
+JOIN category c ON fc.category_id = c.category_id
+WHERE c.name = 'Family';

SQL SUBQUERIES/5.sql

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+SELECT first_name, last_name, email
+FROM customer
+WHERE address_id IN (
+    SELECT address_id
+    FROM address a
+    JOIN city c ON a.city_id = c.city_id
+    JOIN country co ON c.country_id = co.country_id
+    WHERE co.country = 'Canada'
+);

SQL SUBQUERIES/6.sql

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+SELECT f.title
+FROM film f
+JOIN film_actor 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(film_id) DESC
+    LIMIT 1
+);

SQL SUBQUERIES/7.sql

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+SELECT cu.customer_id, cu.first_name, cu.last_name, SUM(p.amount) AS total_spent
+FROM customer cu
+JOIN payment p ON cu.customer_id = p.customer_id
+GROUP BY cu.customer_id, cu.first_name, cu.last_name
+ORDER BY total_spent DESC
+LIMIT 1;

SQL SUBQUERIES/8.sql

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+SELECT customer_id, SUM(amount) AS total_amount_spent
+FROM payment
+GROUP BY customer_id
+HAVING SUM(amount) > (SELECT AVG(total_amount) 
+                      FROM (SELECT SUM(amount) AS total_amount 
+                            FROM payment 
+                            GROUP BY customer_id) AS subquery);