lab-sql-subqueries[Haissa]

lab-sql-subqueries.sql

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+-- How many copies of the film Hunchback Impossible exist in the inventory system?
+SELECT COUNT(F.TITLE) AS COPIES
+FROM SAKILA.INVENTORY I 
+LEFT JOIN SAKILA.FILM F 
+ON I.FILM_ID = F.FILM_ID
+WHERE F.TITLE = 'Hunchback Impossible';
+
+-- List all films whose length is longer than the average of all the films.
+SELECT TITLE
+FROM SAKILA.FILM 
+WHERE LENGTH > (
+SELECT AVG(LENGTH) 
+FROM SAKILA.FILM)
+ORDER BY LENGTH ; 
+
+-- Use subqueries to display all actors who appear in the film Use subqueries to display all actors who appear in the film Alone Trip..
+SELECT CONCAT(FIRST_NAME, ' ' , LAST_NAME) AS ACTOR_NAME
+FROM SAKILA.ACTOR
+WHERE ACTOR_ID IN (
+SELECT FA.ACTOR_ID AS ALONE_TRIP_ACT
+FROM SAKILA.FILM_ACTOR FA
+LEFT JOIN SAKILA.FILM F 
+ON FA.FILM_ID = F.FILM_ID
+WHERE F.TITLE = 'Alone Trip');
+
+-- Sales have been lagging among young families, and you wish to target all family movies for a promotion.
+-- Identify all movies categorized as family films.
+SELECT NAME
+FROM SAKILA.CATEGORY;
+
+SELECT TITLE
+FROM SAKILA.FILM 
+WHERE FILM_ID IN (
+SELECT FILM_ID
+FROM SAKILA.FILM_CATEGORY 
+WHERE CATEGORY_ID IN (
+SELECT CATEGORY_ID
+FROM SAKILA.CATEGORY
+WHERE NAME = 'Family'));
+
+-- Get name and email from customers from Canada using subqueries. Do the same with joins. 
+-- Note that to create a join, you will have to identify the correct tables with their primary keys and foreign keys, 
+-- that will help you get the relevant information.
+
+-- Using Joins
+SELECT CONCAT(C.FIRST_NAME, ' ' , LAST_NAME) AS CUSTOM_NAME_CA, C.EMAIL
+FROM SAKILA.CUSTOMER C
+LEFT JOIN SAKILA.ADDRESS A
+ON C.ADDRESS_ID = A.ADDRESS_ID
+LEFT JOIN SAKILA.CITY CC 
+ON A.CITY_ID = CC.CITY_ID
+LEFT JOIN SAKILA.COUNTRY CN
+ON CC.COUNTRY_ID = CN.COUNTRY_ID
+WHERE CN.COUNTRY = 'Canada';
+
+-- Using subqueries
+SELECT CONCAT(FIRST_NAME, ' ' , LAST_NAME) AS CUSTOM_NAME_CA, EMAIL 
+FROM SAKILA.CUSTOMER
+WHERE ADDRESS_ID IN (
+SELECT ADDRESS_ID
+FROM SAKILA.ADDRESS
+WHERE CITY_ID IN (
+SELECT CITY_ID
+FROM SAKILA.CITY 
+WHERE COUNTRY_ID IN (
+SELECT COUNTRY_ID
+FROM SAKILA.COUNTRY
+WHERE COUNTRY = 'Canada')));
+
+-- Which are films starred by the most prolific actor? 
+-- Most prolific actor is defined as the actor that has acted in the most number of films. 
+-- First you will have to find the most prolific actor and then use that actor_id to find the different films that he/she starred.
+SELECT ACTOR_ID, COUNT(DISTINCT FILM_ID) AS NUMBER_OF_FILMS
+FROM SAKILA.FILM_ACTOR
+GROUP BY 1
+ORDER BY 2 DESC;
+
+SELECT TITLE
+FROM SAKILA.FILM
+WHERE FILM_ID IN (
+SELECT FILM_ID
+FROM SAKILA.FILM_ACTOR
+WHERE ACTOR_ID = '107');
+
+-- Films rented by most profitable customer. 
+-- You can use the customer table and payment table to find the most profitable customer ie the customer 
+-- that has made the largest sum of payments.
+
+SELECT CUSTOMER_ID, SUM(AMOUNT) AS PAYMENTS
+FROM SAKILA.PAYMENT
+GROUP BY 1
+ORDER BY 2 DESC 
+LIMIT 1;
+