selectiiiing_Martina

mysql-select.sql

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+USE sakila;
+-- How many distinct (different) actors' last names are there?
+select count(distinct(last_name)) from actor;
+
+-- In how many different languages where the films originally produced? (Use the column `language_id` from the `film` table)
+select count(distinct(language_id)) from film;
+
+-- How many movies were released with `"PG-13"` rating?
+select count(rating) from film 
+where rating = "PG-13";
+
+-- Get 10 the longest movies from 2006.
+select * from film
+where release_year >= 2006 
+order by length desc limit 10;
+
+-- How many days has been the company operating (check `DATEDIFF()` function)?
+select datediff(max(return_date), min(rental_date)) as date_diff from rental;
+
+-- Show rental info with additional columns month and weekday. Get 20.
+select
+rental_date,
+month(rental_date) as month, 
+DAYOFWEEK(rental_date) as dayofweek
+from rental
+LIMIT 20; 
+
+-- Add an additional column `day_type` with values 'weekend' and 'workday' depending on the rental day of the week.
+
+
+set sql_safe_updates = 0;
+alter table rental
+add day_type varchar(10);
+
+UPDATE rental
+SET day_type = CASE
+                WHEN DAYOFWEEK(rental_date) IN (1, 7) THEN 'Weekend'
+                ELSE 'Worday'
+              END;
+
+-- How many rentals were in the last month of activity?
+select count(*)
+from rental
+where month(rental_date) = (select month(max(rental_date)) from rental);
+
+-- Get film ratings
+select title, rating from film
+
+-- Get release years.
+select title, release_year 
+from film
+
+-- Get all films with ARMAGEDDON in the title.
+select title from film
+where title like "%ARMAGEDDON%"
+
+-- Get all films with APOLLO in the title
+select title from film
+where title like "%APOLLO%"
+
+-- Get all films which title ends with APOLLO.
+select title from film
+where title like "%APOLLO"
+
+-- Get all films with word DATE in the title.
+select title from film
+where title regexp '\\bDATE\\b'
+
+-- Get 10 films with the longest title.
+select title from film
+order by length(title) desc
+limit 10;
+
+-- Get 10 the longest films.
+select title, length from film
+order by length(length) desc
+limit 10;
+
+-- How many films include **Behind the Scenes** content?
+select count(*)
+from film
+where special_features like "%Behind the Scenes%";
+
+-- List films ordered by release year and title in alphabetical order.
+select release_year, title from film
+order by release_year
+
+-- Drop column `picture` from `staff`
+alter table staff
+drop column picture;
+
+-- A new person is hired to help Jon. Her name is TAMMY SANDERS, and she is a customer. Update the database accordingly.
+select * from staff
+where first_name = "JON";
+
+INSERT INTO STAFF VALUES("3", "Tammy", "Sanders", 6, "tammy.sanders@sakilastaff.com", "2", "1", "tammy", "tammy", "2023-10-25")
+
+
+