Week 4 SQL Aggregation and Transformation Lab done !

Week_4_SQL_Aggregation_Transformation_Lab.sql

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+-- SQL Aggregation and Transformation Lab --
+
+-- CHALLENGE 1 --
+-- 1.1. The shortest and Longest movie durations
+SELECT MIN(length) AS min_duration,
+       MAX(length) AS max_duration
+FROM film;
+
+-- 1.2. The average movie duration in hours and minutes without decimals
+SELECT FLOOR(AVG(length) / 60) AS avg_duration_hours,
+       FLOOR(AVG(length) % 60) AS avg_duration_minutes
+FROM film;
+
+-- 2.1. The number of days that the company has been operating
+SELECT DATEDIFF(CURDATE(), MIN(rental_date)) AS days_operating
+FROM rental;
+
+-- 2.2. Rental table with month and weekday new columns
+SELECT *,
+       MONTHNAME(rental_date) AS rental_month,
+       DAYNAME(rental_date) AS rental_weekday
+FROM rental
+LIMIT 20;
+
+-- Bonus 2.3.  Rental table with Day_type new column
+SELECT *,
+       CASE
+           WHEN DAYOFWEEK(rental_date) IN (1, 7) THEN 'Weekend' -- 1 = Sunday, 7 = Saturday
+           ELSE 'Weekday'
+       END AS day_type
+FROM rental
+LIMIT 20;
+
+-- 3. Film titles and their rental duration with 'Not Available' for NULLs
+SELECT title,
+       rental_duration,
+       IFNULL(rental_duration, 'Not Available') AS rental_duration_status
+FROM film
+ORDER BY rental_duration DESC, title ASC
+
+-- 4. Customer full names and email prefixes
+SELECT CONCAT(first_name, ' ', last_name) AS full_name,
+         LEFT(email, 3) AS email_prefix
+FROM customer
+ORDER BY last_name ASC;
+
+-- CHALLENGE 2 --
+-- 1.1 The total number of films that have been released
+SELECT COUNT(*) AS total_films
+FROM film;
+
+-- 1.2 / 1.3 The number of films for each rating
+SELECT rating,
+       COUNT(*) AS number_of_films
+FROM film
+GROUP BY rating
+ORDER BY number_of_films DESC;
+
+-- 2.1 The mean film duration for each rating
+SELECT ROUND(AVG(length), 2) AS mean_film_duration,
+       rating
+FROM film
+GROUP BY rating
+ORDER BY mean_film_duration DESC;
+
+-- 2.2 Ratings that have a mean duration of over two hours
+SELECT rating,
+       ROUND(AVG(length), 2) AS mean_film_duration
+FROM film
+GROUP BY rating
+HAVING mean_film_duration > 120
+ORDER BY mean_film_duration DESC;
+
+-- Bonus 3. Last names are not repeated in the table actor
+SELECT DISTINCT last_name
+FROM actor
+ORDER BY last_name ASC;