From a668f3630b6c58fdbc405be8bdfddd972f6a71ef Mon Sep 17 00:00:00 2001
From: mariamnez <mariamtnez1969@gmail.com>
Date: Thu, 21 Aug 2025 10:42:32 +0200
Subject: [PATCH] Solved lab

---
 Challenge 1.sql | 40 ++++++++++++++++++++++++++++++++++++++++
 Challenge 2.sql | 27 +++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 Challenge 1.sql
 create mode 100644 Challenge 2.sql

diff --git a/Challenge 1.sql b/Challenge 1.sql
new file mode 100644
index 0000000..568a60c
--- /dev/null
+++ b/Challenge 1.sql	
@@ -0,0 +1,40 @@
+USE sakila;
+SELECT 
+  MIN(length) AS min_duration,
+  MAX(length) AS max_duration
+FROM film;
+SELECT
+  FLOOR(AVG(length) / 60) AS avg_hours,
+  (ROUND(AVG(length)) - 60 * FLOOR(AVG(length) / 60)) AS avg_minutes
+FROM film;
+SELECT 
+  DATEDIFF(MAX(rental_date), MIN(rental_date)) AS days_operating
+FROM rental;
+SELECT 
+  rental_id,
+  rental_date,
+  DATE_FORMAT(rental_date, '%M') AS rental_month,
+  DATE_FORMAT(rental_date, '%W') AS rental_weekday
+FROM rental
+ORDER BY rental_date
+LIMIT 20;
+SELECT 
+  rental_id,
+  rental_date,
+  CASE 
+    WHEN DAYOFWEEK(rental_date) IN (1,7) THEN 'weekend'
+    ELSE 'workday'
+  END AS day_type
+FROM rental
+ORDER BY rental_date
+LIMIT 20;
+SELECT 
+  title,
+  IFNULL(CAST(rental_duration AS CHAR), 'Not Available') AS rental_duration
+FROM film
+ORDER BY title ASC;
+SELECT
+  CONCAT(first_name, ' ', last_name) AS full_name,
+  SUBSTRING(email, 1, 3)           AS email_prefix
+FROM customer
+ORDER BY last_name ASC, first_name ASC;
diff --git a/Challenge 2.sql b/Challenge 2.sql
new file mode 100644
index 0000000..5e64d9a
--- /dev/null
+++ b/Challenge 2.sql	
@@ -0,0 +1,27 @@
+SELECT COUNT(*) AS total_films
+FROM film;
+SELECT rating, COUNT(*) AS num_films
+FROM film
+GROUP BY rating;
+SELECT rating, COUNT(*) AS num_films
+FROM film
+GROUP BY rating
+ORDER BY num_films DESC;
+SELECT 
+  rating,
+  ROUND(AVG(length), 2) AS mean_duration
+FROM film
+GROUP BY rating
+ORDER BY mean_duration DESC;
+SELECT 
+  rating,
+  ROUND(AVG(length), 2) AS mean_duration
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120
+ORDER BY mean_duration DESC;
+SELECT last_name
+FROM actor
+GROUP BY last_name
+HAVING COUNT(*) = 1
+ORDER BY last_name;