From 45734eed05184195efb88e1637606543cfdb23b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ant=C3=B3nio=20Gomes?= <antmgomes@outlook.com>
Date: Fri, 31 Oct 2025 12:45:32 +0100
Subject: [PATCH] Done With Agregation Lab

---
 lab_aggregation.sql | 79 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 lab_aggregation.sql

diff --git a/lab_aggregation.sql b/lab_aggregation.sql
new file mode 100644
index 0000000..bd49165
--- /dev/null
+++ b/lab_aggregation.sql
@@ -0,0 +1,79 @@
+USE  sakila;
+#Challenge 1
+#1
+#1.1
+SELECT MAX(f.length) AS max_duration, MIN(f.length) AS min_duration FROM sakila.film AS f;
+
+#1.2
+SELECT SEC_TO_TIME(ROUND(AVG(f.length) * 60, -2)) AS avg_duration FROM sakila.film AS f;
+
+#2
+#2.1
+SELECT DATEDIFF(
+  (SELECT MAX(rental_date) FROM sakila.rental),
+  (SELECT MIN(rental_date) FROM sakila.rental)
+) AS nr_of_days_open;
+
+#2.2
+-- SELECT *, EXTRACT(MONTH FROM rental_date) AS month, DAYOFWEEK(rental_date) AS day_of_week FROM sakila.rental;
+SELECT *, EXTRACT(MONTH FROM rental_date) AS month,
+  CASE
+	WHEN DAYOFWEEK(rental_date) = 1  THEN 'Sunday'
+    WHEN DAYOFWEEK(rental_date) = 2  THEN 'Monday'
+    WHEN DAYOFWEEK(rental_date) = 3  THEN 'Tuesday'
+    WHEN DAYOFWEEK(rental_date) = 4  THEN 'Wednesday'
+    WHEN DAYOFWEEK(rental_date) = 5  THEN 'Thursday'
+	WHEN DAYOFWEEK(rental_date) = 6  THEN 'Friday'
+    ELSE 'Saturday' 
+  END AS day_of_week
+FROM sakila.rental;
+
+#2.3
+SELECT *,
+CASE
+	WHEN DAYOFWEEK(rental_date) = 1  THEN 'Weekend'
+    WHEN DAYOFWEEK(rental_date) = 2  THEN 'Workday'
+    WHEN DAYOFWEEK(rental_date) = 3  THEN 'Workday'
+    WHEN DAYOFWEEK(rental_date) = 4  THEN 'Workday'
+    WHEN DAYOFWEEK(rental_date) = 5  THEN 'Workday'
+	WHEN DAYOFWEEK(rental_date) = 6  THEN 'Weekend'
+END AS day_type
+FROM sakila.rental;
+
+#3
+SELECT title, IFNULL(rental_duration, 'Not Available') AS rental_duration FROM sakila.film
+ORDER BY title ASC;
+
+#4
+SELECT *, CONCAT(first_name, last_name, SUBSTRING(email, 1, 3)) AS personalized_email FROM sakila.customer
+ORDER BY last_name ASC;
+
+#Challenge 2
+#1
+#1.1
+SELECT * FROM sakila.film;
+SELECT COUNT(*) as n_films_released FROM sakila.film;
+
+#1.2
+SELECT rating, COUNT(*) AS nr_of_films FROM sakila.film
+GROUP BY rating;
+
+#1.3
+SELECT rating, COUNT(*) AS nr_of_films FROM sakila.film
+GROUP BY rating
+ORDER BY nr_of_films DESC;
+
+#2.
+#2.1
+SELECT rating, ROUND(AVG(length), 2) AS avg_length FROM sakila.film
+GROUP BY rating
+ORDER BY avg_length DESC;
+
+#2.2
+SELECT rating, ROUND(AVG(length), 2) AS avg_length FROM sakila.film
+WHERE (SELECT ROUND(AVG(length), 2) > 120)
+GROUP BY rating
+ORDER BY avg_length DESC;
+
+#3
+SELECT DISTINCT last_name AS unique_last_names FROM sakila.actor
\ No newline at end of file