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Lab 5.sql

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+-- Determining the Number of Copies of the Film "Hunchback Impossible"
+USE sakila;
+
+SELECT 
+    COUNT(*) AS number_of_copies
+FROM 
+    inventory
+WHERE 
+    film_id = (SELECT film_id FROM film WHERE title = 'Hunchback Impossible');
+
+-- Listing All Films Longer Than Average Length
+SELECT 
+    title, 
+    length
+FROM 
+    film
+WHERE 
+    length > (SELECT AVG(length) FROM film);
+
+-- Displaying All Actors in "Alone Trip"
+SELECT 
+    a.first_name, 
+    a.last_name
+FROM 
+    actor a
+JOIN 
+    film_actor fa ON a.actor_id = fa.actor_id
+WHERE 
+    fa.film_id = (SELECT film_id FROM film WHERE title = 'Alone Trip');
+
+-- Identifying 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';
+
+-- Retrieving Name and Email of Customers from Canada 
+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'
+            )
+        )
+    );
+
+-- Determining Films Starred by Most Prolific Actor
+-- most prolific actor
+
+SELECT 
+    actor_id 
+FROM 
+    film_actor 
+GROUP BY 
+    actor_id 
+ORDER BY 
+    COUNT(film_id) DESC 
+LIMIT 1;
+-- retrieving films starred by this actor
+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
+    );
+
+-- Retrieving Films Rented by Most Profitable Customer
+-- most profitable customer
+SELECT 
+    customer_id
+FROM 
+    payment
+GROUP BY 
+    customer_id
+ORDER BY 
+    SUM(amount) DESC 
+LIMIT 1;
+-- films rented by this customer
+SELECT 
+    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 
+            payment 
+        GROUP BY 
+            customer_id 
+        ORDER BY 
+            SUM(amount) DESC 
+        LIMIT 1
+    );
+
+-- Retrieving Clients Who Spend More Than Average Total Amount
+-- Calculating the total and comparing it against the average
+SELECT 
+    customer_id, 
+    total_amount_spent
+FROM (
+    SELECT 
+        customer_id, 
+        SUM(amount) AS total_amount_spent
+    FROM 
+        payment
+    GROUP BY 
+        customer_id
+    ) AS customer_totals
+WHERE 
+    total_amount_spent > (
+        SELECT 
+            AVG(customer_total) 
+        FROM (
+            SELECT 
+                SUM(amount) AS customer_total
+            FROM 
+                payment
+            GROUP BY 
+                customer_id
+            ) AS totals
+    );