From 9e584381c5abf18b74765cbc3268524cdbe85d04 Mon Sep 17 00:00:00 2001
From: Irma Fernandez <fernandezwic@gmail.com>
Date: Thu, 18 Sep 2025 14:06:52 +0200
Subject: [PATCH 1/4] Solved Lab 3

---
 solutions_lab3.sql | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 solutions_lab3.sql

diff --git a/solutions_lab3.sql b/solutions_lab3.sql
new file mode 100644
index 0000000..00594db
--- /dev/null
+++ b/solutions_lab3.sql
@@ -0,0 +1,96 @@
+USE sakila;
+--   CHALLENGE 1
+ 
+/* 1.1 Shortest and longest movie durations (minutes) */
+SELECT 
+  MIN(length) AS min_duration,
+  MAX(length) AS max_duration
+FROM film;
+
+/* 1.2 Average movie duration in hours and minutes  */
+SELECT 
+  FLOOR(AVG(length) / 60) AS avg_hours,
+  FLOOR(AVG(length)) % 60 AS avg_minutes
+FROM film;
+
+/* 2.1 Days the company has been operating (based on rentals) */
+SELECT 
+  DATEDIFF(MAX(rental_date), MIN(rental_date)) AS days_operating
+FROM rental;
+
+/* 2.2 Show month and weekday for rentals (20 rows) */
+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;
+
+/* 2.3 Add DAY_TYPE = 'weekend' or 'workday' (20 rows) */
+SELECT 
+  rental_id,
+  rental_date,
+  CASE 
+    WHEN DAYOFWEEK(rental_date) IN (1,7) THEN 'weekend'  -- 1=Sun, 7=Sat
+    ELSE 'workday'
+  END AS day_type
+FROM rental
+ORDER BY rental_date
+LIMIT 20;
+
+/* 3. Film titles and rental duration, replace NULL with 'Not Available' */
+
+SELECT 
+  title,
+  IFNULL(CAST(rental_duration AS CHAR), 'Not Available') AS rental_duration
+FROM film
+ORDER BY title ASC;
+
+/* 4. Full name + first 3 chars of email, order by last name */
+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;
+
+   -- CHALLENGE 2
+
+/* 1.1 Total number of films released */
+SELECT COUNT(*) AS total_films FROM film;
+
+/* 1.2 Number of films for each rating */
+SELECT 
+  rating,
+  COUNT(*) AS films
+FROM film
+GROUP BY rating
+ORDER BY rating;
+
+/* 1.3 Number of films for each rating, sorted by count descending */
+SELECT 
+  rating,
+  COUNT(*) AS films
+FROM film
+GROUP BY rating
+ORDER BY films DESC, rating ASC;
+
+/* 2.1 Mean film duration per rating, rounded to 2 decimals */
+SELECT 
+  rating,
+  ROUND(AVG(length), 2) AS mean_duration_minutes
+FROM film
+GROUP BY rating
+ORDER BY rating;
+
+/* 2.2 Ratings with mean duration > 2 hours (120 minutes) */
+SELECT 
+  rating,
+  ROUND(AVG(length), 2) AS mean_duration_minutes
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120
+ORDER BY mean_duration_minutes DESC;
+
+/* 3. Last names that are NOT repeated in actor table */

From 9cbeed3295f5958a5b99278e45ffa27336f5e603 Mon Sep 17 00:00:00 2001
From: Irma Fernandez <fernandezwic@gmail.com>
Date: Thu, 18 Sep 2025 14:14:13 +0200
Subject: [PATCH 2/4] Fix order mx an min duration columns

---
 solutions_lab3.sql | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/solutions_lab3.sql b/solutions_lab3.sql
index 00594db..ac15651 100644
--- a/solutions_lab3.sql
+++ b/solutions_lab3.sql
@@ -3,9 +3,9 @@ USE sakila;
  
 /* 1.1 Shortest and longest movie durations (minutes) */
 SELECT 
-  MIN(length) AS min_duration,
-  MAX(length) AS max_duration
-FROM film;
+  MAX(length) AS max_duration,
+  MIN(length) AS min_duration
+  FROM film;
 
 /* 1.2 Average movie duration in hours and minutes  */
 SELECT 

From 3e378c773edce225b7cc6fadc2398c481712ccb6 Mon Sep 17 00:00:00 2001
From: Irma Fernandez <fernandezwic@gmail.com>
Date: Thu, 18 Sep 2025 14:19:22 +0200
Subject: [PATCH 3/4] Fix 2 order mx an min duration columns

---
 solutions_lab3.sql | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/solutions_lab3.sql b/solutions_lab3.sql
index ac15651..0364e5f 100644
--- a/solutions_lab3.sql
+++ b/solutions_lab3.sql
@@ -2,10 +2,8 @@ USE sakila;
 --   CHALLENGE 1
  
 /* 1.1 Shortest and longest movie durations (minutes) */
-SELECT 
-  MAX(length) AS max_duration,
-  MIN(length) AS min_duration
-  FROM film;
+SELECT MAX(rental_duration) AS max_duration, MIN(rental_duration) AS min_duration
+FROM film;
 
 /* 1.2 Average movie duration in hours and minutes  */
 SELECT 

From c684e23ba9e1c88932a26ff3be2e47f27f2fae47 Mon Sep 17 00:00:00 2001
From: Irma Fernandez <fernandezwic@gmail.com>
Date: Thu, 18 Sep 2025 14:26:11 +0200
Subject: [PATCH 4/4] Fix 2 order mx an min duration columns

---
 solutions_lab3.sql | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/solutions_lab3.sql b/solutions_lab3.sql
index 0364e5f..1c5a0c2 100644
--- a/solutions_lab3.sql
+++ b/solutions_lab3.sql
@@ -92,3 +92,11 @@ HAVING AVG(length) > 120
 ORDER BY mean_duration_minutes DESC;
 
 /* 3. Last names that are NOT repeated in actor table */
+-- Challenge 2 - 3 Bonus
+SELECT 
+  last_name
+FROM actor
+GROUP BY last_name
+HAVING COUNT(*) = 1
+ORDER BY last_name;
+