sesion2

SESIONES/Session_2/create.sql

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+/* 
+    Create table reviews with columns:
+    - film_id
+    - customer_id
+    - review_date
+    - review_description
+*/
+
+CREATE TABLE IF NOT EXISTS public.reviews_ng (
+    film_id int2 NOT NULL,
+    customer_id int2 NOT NULL,
+    review_date date NOT NULL,
+    review_description text NOT NULL,
+    CONSTRAINT reviews_ng_pkey PRIMARY KEY (film_id, customer_id)
+)
+
+
+/* Insert data into reviews_ng */
+
+INSERT INTO
+    public.reviews_ng (film_id, customer_id, review_description, review_date)
+VALUES
+    (4, 7, 'The movie is a bit boring', '10-11-2023')
+
+/* Update */
+
+UPDATE
+	public.reviews_ng
+SET
+	review_date = '01-01-2024'
+WHERE
+	film_id = 4
+
+
+SELECT *
+FROM public.reviews_ng

SESIONES/Session_2/join.sql

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+/*
+	Left Join:
+	Every Movie (even if it's not linked to any language)
+*/
+
+SELECT
+	* -- SELECT COUNT(*)
+FROM
+	film f
+LEFT JOIN
+	language l ON l.language_id = f.language_id
+
+
+/*	
+	Left Join:
+	Every language being 'French' (even if it's not linked to any movie)
+*/
+
+SELECT
+	l.name, f.title -- SELECT COUNT(*)
+FROM
+	language l
+LEFT JOIN
+	film f ON l.language_id = f.language_id
+WHERE
+	l.name = 'French'
+
+
+/* 	
+	Right Join equivalent:
+	Every language being 'French' (even if it's not linked to any movie)
+*/
+
+SELECT
+	l.name, f.title -- SELECT COUNT(*)
+FROM
+	film f
+RIGHT JOIN
+	language l ON l.language_id = f.language_id
+WHERE
+	l.name = 'French'
+
+
+/*
+	Join film, film_actor and actor tables
+	to show every movie an actor appears in
+*/
+
+SELECT
+    f.title, a.first_name, a.last_name -- SELECT COUNT(*)
+FROM
+    film f
+LEFT JOIN
+    film_actor fa ON f.film_id = fa.film_id
+LEFT JOIN
+    actor a ON a.actor_id = fa.actor_id
+
+
+/*
+	Join film, film_actor and actor tables
+    to show number of movies an actor appears in descending order
+	if number of movies > 40
+    (name an last name together in one column)
+*/
+
+SELECT
+    a.first_name || ' ' || a.last_name AS "Actor", COUNT(*) AS "Movies" -- SELECT COUNT(*)
+FROM
+    film_actor fa
+LEFT JOIN
+    film f ON f.film_id = fa.film_id
+LEFT JOIN
+    actor a ON a.actor_id = fa.actor_id
+GROUP BY
+    a.first_name, a.last_name
+HAVING
+	COUNT(*) > 40
+ORDER BY
+	COUNT(*) DESC
+
+
+/*
+	Join film, film_actor and actor tables
+    to show number of actors appearing in a movie in descending order
+	if number of actors > 10
+    (name an last name together in one column)
+*/
+
+SELECT
+    f.title AS "Film", COUNT(*) AS "Actors" -- SELECT COUNT(*)
+FROM
+    film f
+LEFT JOIN
+    film_actor fa ON f.film_id = fa.film_id
+LEFT JOIN
+    actor a ON a.actor_id = fa.actor_id
+GROUP BY
+    f.title
+HAVING
+    COUNT(*) > 10
+ORDER BY
+    COUNT(*) DESC

SESIONES/Session_2/rating.sql

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+/* Count movies by rating */
+
+SELECT
+	COUNT(*) AS "Total"
+FROM
+	film f
+WHERE
+	f.rating IS NOT null
+GROUP BY
+	f.rating
+
+
+/* Average rental rate by rating with only 1 decimal place */
+
+SELECT
+    ROUND(AVG(f.rental_rate), 1) AS "Avg. Rental Rate", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+    film f
+WHERE
+    f.rental_rate IS NOT null
+GROUP BY
+    f.rating
+
+/* Minimum rental rate by rating */
+
+SELECT
+	MIN(f.rental_rate) AS "Min. Rental Rate", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+/* Maximum rental rate by rating */
+
+SELECT
+	MAX(f.rental_rate) AS "Min. Rental Rate", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+/* Average movie duration by rating */
+
+SELECT
+	ROUND(AVG(f.length), 0) AS "Avg. Movie Duration", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+/* Year of oldest movie by rating */
+
+SELECT
+	MIN(f.release_year) AS "Oldest Movie", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+/* Year of oldest movie by rating */
+
+SELECT
+	MAX(f.release_year) AS "Oldest Movie", f.rating AS "Rating" -- SELECT COUNT(*)
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+
+/* Grouped stats by rating */
+
+SELECT
+	f.rating AS "Rating",
+	COUNT(*) AS "Total",
+    ROUND(AVG(f.rental_rate), 1) AS "Avg. Rental Rate",
+	MIN(f.rental_rate) AS "Min. Rental Rate",
+	MAX(f.rental_rate) AS "Min. Rental Rate",
+	ROUND(AVG(f.length), 0) AS "Avg. Movie Duration",
+	MIN(f.release_year) AS "Oldest Movie",
+	MAX(f.release_year) AS "Oldest Movie"
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+
+
+/* Number of movies grouped by rating having at least 200 movies */
+
+SELECT
+	f.rating AS "Rating",
+	COUNT(*) AS "Total"
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+HAVING
+	COUNT(*) > 200
+
+
+/* Average rental rate grouped by rating having at least an average rental rate of 3 */
+
+SELECT
+	f.rating AS "Rating",
+    ROUND(AVG(f.rental_rate), 1) AS "Avg. Rental Rate"
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+HAVING
+	AVG(f.rental_rate) > 3
+
+
+/* Average movie duration grouped by rating having at least an average movie duration of 115 */
+
+SELECT
+	f.rating AS "Rating",
+	ROUND(AVG(f.length), 0) AS "Avg. Movie Duration"
+FROM
+	film f
+WHERE
+	f.rental_rate IS NOT null
+GROUP BY
+	f.rating
+HAVING
+	ROUND(AVG(f.length), 0) > 115
+
+
+/* Join */