Lab 2 Basic Queries terminado

basic queries.sql

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+-- LABORATORIO 2
+
+USE sakila;
+
+# 1. Display all available tables in the Sakila database.
+
+SHOW tables;
+
+
+# 2. Retrieve all the data from the tables actor, film and customer.
+
+SELECT * FROM actor;
+SELECT * FROM film;
+SELECT * FROM customer;
+
+
+# 3. Retrieve the following columns from their respective tables:
+	# 3.1 Titles of all films from the film table
+
+    SELECT title FROM film;
+
+    #3.2 List of languages used in films, with the column aliased as language from the language table
+
+    SELECT name FROM language;
+
+    # 3.3 List of first names of all employees from the staff table
+
+    SELECT first_name FROM staff;
+
+
+# 4. Retrieve unique release years.
+
+    SELECT DISTINCT release_year FROM film;
+
+
+# 5. Counting records for database insights:
+	# 5.1 Determine the number of stores that the company has.
+
+    SELECT COUNT(DISTINCT store_id)  FROM store;
+
+    # 5.2 Determine the number of employees that the company has.
+
+    SELECT COUNT(DISTINCT staff_id)  FROM staff;
+
+    # 5.3 Determine how many films are available for rent and how many have been rented.
+
+    SELECT COUNT(DISTINCT film_id)  FROM inventory; # Calculado contando el total de peliculas diferentes del inventario, sin comprobar si se han alquilado alguna vez o no 
+    SELECT COUNT(DISTINCT rental_id)  FROM rental; # Calculado por copias alquiladas, no por peliculas diferentes alquiladas
+
+    # 5.4 Determine the number of distinct last names of the actors in the database.
+
+    SELECT COUNT(DISTINCT last_name)  FROM actor;
+
+
+# 6. Retrieve the 10 longest films.
+
+SELECT title FROM film
+ORDER BY length DESC
+LIMIT 5; 
+
+# 7. Use filtering techniques in order to:
+
+	# 7.1 Retrieve all actors with the first name "SCARLETT".
+
+	SELECT actor_id, first_name, last_name FROM actor
+	WHERE first_name like 'SCARLETT%'; 
+
+	# 7.2 Retrieve all movies that have ARMAGEDDON in their title and have a duration longer than 100 minutes.
+
+	SELECT title FROM film
+	WHERE title like '%ARMAGEDDON%'
+    AND length > 100; 
+
+	# 7.3 Determine the number of films that include Behind the Scenes content
+
+	SELECT COUNT(DISTINCT title) FROM film
+	WHERE special_features like '%BEHIND THE SCENES%';
+
+