From 814ef134e1afee83255f62fb4bb83e2a2261e537 Mon Sep 17 00:00:00 2001
From: DaraH <sombeinar@gmail.com>
Date: Mon, 6 Jan 2025 09:22:54 -0400
Subject: [PATCH] Add files via upload

---
 SQL Subqueries lab.sql | 99 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 SQL Subqueries lab.sql

diff --git a/SQL Subqueries lab.sql b/SQL Subqueries lab.sql
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+-- Query #1:  How many copies of the film Hunchback Impossible exist in the inventory system?
+SELECT COUNT(*) AS total_copies
+FROM inventory
+WHERE film_id = (
+    SELECT film_id
+    FROM film
+    WHERE title = 'Hunchback Impossible'
+);
+
+-- Query #2: List all films whose length is longer than the average of all the films.
+SELECT title, length
+FROM film
+WHERE length > (SELECT AVG(length) FROM film);
+
+-- Query #3: Use subqueries to display all actors who appear in the film Alone Trip.
+SELECT first_name, last_name
+FROM actor
+WHERE actor_id IN (
+    SELECT actor_id
+    FROM film_actor
+    WHERE film_id = (
+        SELECT film_id
+        FROM film
+        WHERE title = 'Alone Trip'
+    )
+);
+
+-- Query #4: Identify all movies categorized as family films.
+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';
+
+-- Query #5: Get name and email from customers from Canada using subqueries.
+SELECT first_name, last_name, email
+FROM customer
+WHERE address_id IN (
+    SELECT address_id
+    FROM address
+    WHERE city_id IN (
+        SELECT city_id
+        FROM city
+        WHERE country_id = (
+            SELECT country_id
+            FROM country
+            WHERE country = 'Canada'
+        )
+    )
+);
+
+-- Query #6: Films starred by the most prolific actor.
+WITH prolific_actor AS (
+    SELECT actor_id
+    FROM film_actor
+    GROUP BY actor_id
+    ORDER BY COUNT(film_id) DESC
+    LIMIT 1
+)
+ 
+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 prolific_actor);
+
+-- Query #7: Films rented by the most profitable customer.
+WITH profitable_customer AS (
+    SELECT customer_id, SUM(amount) AS total_spent
+    FROM payment
+    GROUP BY customer_id
+    ORDER BY total_spent DESC
+    LIMIT 1
+)
+ 
+SELECT DISTINCT f.title
+FROM rental r
+JOIN inventory i ON r.inventory_id = i.inventory_id
+JOIN film f ON i.film_id = f.film_id
+WHERE r.customer_id = (SELECT customer_id FROM profitable_customer);
+
+-- Query #8: Get client_id and total_amount_spent for clients who spent more than the average total amount.
+SELECT customer_id, SUM(amount) AS total_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
+    ) subquery
+);
+
+
+
+
+
+
+