Create lab3 week4.sql

lab3 week4.sql

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+USE sakila;
+
+-- ------------
+-- Challenge 1
+-- ------------
+SELECT
+  MAX(length) AS max_duration,
+  MIN(length) AS min_duration
+FROM film;
+
+SELECT
+  FLOOR(AVG(length) / 60) AS avg_hours,
+  FLOOR(AVG(length) % 60) AS avg_minutes
+FROM film;
+
+SELECT
+  DATEDIFF(MAX(rental_date), MIN(rental_date)) AS operating_days
+FROM rental;
+
+SELECT
+  rental_id,
+  rental_date,
+  MONTHNAME(rental_date) AS rental_month,
+  DAYNAME(rental_date)   AS rental_weekday,
+  inventory_id,
+  customer_id,
+  staff_id
+FROM rental
+ORDER BY rental_date
+LIMIT 20;
+
+SELECT
+  rental_id,
+  rental_date,
+  DAYNAME(rental_date) AS rental_weekday,
+  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;
+
+-- =========================
+-- Challenge 2 (counts)
+-- =========================
+
+-- 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 film_count
+FROM film
+GROUP BY rating
+ORDER BY rating;
+
+-- 1.3 Number of films for each rating, sorted by film_count desc
+SELECT rating, COUNT(*) AS film_count
+FROM film
+GROUP BY rating
+ORDER BY film_count DESC, rating;
+
+-- ============
+-- Challenge 2
+-- ============
+
+SELECT
+  rating,
+  ROUND(AVG(length), 2) AS avg_length_minutes
+FROM film
+GROUP BY rating
+ORDER BY avg_length_minutes DESC;
+
+SELECT
+  rating,
+  ROUND(AVG(length), 2) AS avg_length_minutes
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120
+ORDER BY avg_length_minutes DESC;