[Felix] sql-select

select-lab.sql

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+use sakila;
+
+-- 1. How many distinct (different) actors' last names are there?
+SELECT 
+    COUNT(DISTINCT (last_name))
+FROM
+    actor;
+
+
+-- 2. In how many different languages where the films originally produced? (Use the column `language_id` from the `film` table)
+
+SELECT 
+    COUNT(DISTINCT (language_id)) as languages 
+FROM
+    film;
+
+
+-- 3. How many movies were released with `"PG-13"` rating?
+
+
+SELECT 
+    COUNT(rating)
+FROM
+    film
+WHERE
+    rating = 'pg-13';
+
+
+-- 4. Get 10 the longest movies from 2006.
+
+SELECT 
+    title, length
+FROM
+    film
+where release_year = "2006"
+ORDER BY length DESC
+LIMIT 10;
+
+
+-- 5. How many days has been the company operating (check `DATEDIFF()` function)?
+SELECT 
+    DATEDIFF(MAX(rental_date), MIN(rental_date)) AS days
+FROM
+    rental;
+
+
+-- 6. Show rental info with additional columns month and weekday. Get 20.
+
+SELECT 
+    *,
+    MONTH(rental_Date) AS rental_month,
+    DAYNAME(rental_date) AS rental_weekday
+FROM
+    rental
+LIMIT 20;
+
+
+
+-- 7. Add an additional column `day_type` with values 'weekend' and 'workday' depending on the rental day of the week.
+
+SELECT 
+    *,
+    MONTH(rental_Date) AS rental_month,
+    DAYNAME(rental_date) AS rental_weekday,
+    CASE
+        WHEN DAYOFWEEK(rental_date) IN (2, 3, 4, 5, 6) THEN 'laboral'
+        WHEN DAYOFWEEK(rental_date) IN (1 , 7) THEN 'weekend'
+    END AS day_type
+FROM
+    rental;
+
+
+-- 8. How many rentals were in the last month of activity?
+
+SELECT COUNT(*) AS rental_count
+FROM rental
+WHERE
+    rental_date >= (select max(rental_date) from rental) - interval 1 month;
+
+
+-- 9. Get film ratings.
+
+SELECT DISTINCT
+    (rating)
+FROM
+    film;
+
+
+-- 10. Get release years.
+
+select distinct (release_year) from film;
+
+
+
+-- 11. Get all films with ARMAGEDDON in the title.
+
+SELECT 
+    *
+FROM
+    film
+WHERE
+    title like '%armageddon%';
+
+
+-- 12. Get all films with APOLLO in the title
+SELECT 
+    *
+FROM
+    film
+WHERE
+    title like '%apollo%';
+
+-- 13. Get all films which title ends with APOLLO.
+SELECT 
+    *
+FROM
+    film
+WHERE
+    title like '%apollo';
+
+-- 14. Get all films with word DATE in the title.
+SELECT 
+    *
+FROM
+    film
+WHERE
+    title like '%date%';
+
+
+
+-- 15. Get 10 films with the longest title.
+
+SELECT 
+    title, LENGTH(title)
+FROM
+    film
+ORDER BY length(title) DESC
+LIMIT 10;
+
+-- 16. Get 10 the longest films.
+
+select title, length from film
+order by length desc
+limit 10;
+
+-- 17. How many films include **Behind the Scenes** content?
+
+SELECT 
+    COUNT(*)
+FROM
+    film
+WHERE
+    special_features LIKE '%behind the Scenes%';
+
+-- 18. List films ordered by release year and title in alphabetical order.
+
+SELECT *
+FROM film
+ORDER BY title ASC;
+
+
+-- 19. Drop column `picture` from `staff`.
+
+alter table staff drop column picture;
+
+
+-- 20. A new person is hired to help Jon. Her name is TAMMY SANDERS, and she is a customer. Update the database accordingly.
+
+INSERT INTO staff (store_id, first_name, last_name, address_id, username)
+SELECT store_id, first_name, last_name, address_id, 'timmyta_69' 
+from customer
+WHERE first_name = 'Tammy' and last_name = "sanders";
+
+
+-- 21. Add rental for movie "Academy Dinosaur" by Charlotte Hunter from Mike Hillyer at Store 1. 
+-- You can use current date for the `rental_date` column in the `rental` table.
+-- **Hint**: Check the columns in the table rental and see what information you would need to add there. You can query those pieces of information. 
+-- For eg., you would notice that you need `customer_id` information as well. 
+-- To get that you can use the following query:
+
+SELECT customer_id
+FROM customer
+WHERE first_name = 'Charlotte' AND last_name = 'Hunter';
+
+SELECT i.inventory_id
+FROM inventory i
+JOIN film f ON i.film_id = f.film_id
+JOIN store s ON i.store_id = s.store_id
+WHERE f.title = 'Academy Dinosaur' AND s.store_id = 1;
+
+INSERT INTO rental (rental_date, inventory_id, customer_id, staff_id, return_date)
+VALUES (curdate(), '1', '130', '1');
+
+-- 22. Delete non-active users, but first, create a _backup table_ `deleted_users` to store `customer_id`, `email`, and the `date` for the users that would be deleted. Follow these steps:
+
+    -- Check if there are any non-active users
+    -- Create a table _backup table_ as suggested
+    -- Insert the non active users in the table _backup table_
+    -- Delete the non active users from the table _customer_
+
+drop table if exists backup_table;
+CREATE TABLE IF NOT EXISTS backup_table (
+    id int primary key auto_increment,
+    customer_id INT,
+    email VARCHAR(80),
+    date DATE
+);
+
+INSERT INTO backup_table (customer_id, email, date)
+SELECT customer_id, email, last_update
+FROM customer
+WHERE active = '0';
+
+
+
+DELETE FROM payment
+WHERE customer_id IN (SELECT customer_id FROM customer WHERE active = '0');
+
+DELETE FROM rental
+WHERE customer_id IN (SELECT customer_id FROM customer WHERE active = '0');
+
+DELETE FROM customer
+WHERE active = '0';