done

123.sql

@@ -0,0 +1,74 @@
+use sakila;
+
+select max(length) as max_duration, min(length) as min_duration
+from film;
+
+select 
+    floor(AVG(length) / 60) as hours,
+    floor(AVG(length) % 60) as minutes
+from film;
+
+SELECT 
+    DATEDIFF(MAX(rental_date), MIN(rental_date)) AS days_operating
+FROM rental;
+
+SELECT 
+    rental_id,
+    rental_date,
+    monthname(rental_date) AS rental_month,
+    DAYNAME(rental_date) AS rental_weekday
+FROM rental
+LIMIT 20;
+
+SELECT 
+    rental_id,
+    rental_date,
+    DAYNAME(rental_date) AS rental_weekday,
+    CASE 
+        WHEN DAYOFWEEK(rental_date) IN (1, 7) THEN 'weekend'  -- Sunday=1, Saturday=7 in MySQL
+        ELSE 'workday'
+    END AS day_type
+FROM rental
+LIMIT 20;
+
+SELECT 
+    title,
+    IFNULL(rental_duration, 'Not Available') AS rental_duration
+FROM film
+ORDER BY title ASC;
+
+select concat (first_name, ' ',last_name) as Full_name, left(email,3)
+from customer
+order by last_name asc;
+
+SELECT COUNT(*) AS total_films
+FROM film;
+
+SELECT rating, COUNT(*) AS film_count
+FROM film
+GROUP BY rating
+ORDER BY film_count DESC;
+
+SELECT 
+    rating, 
+    ROUND(AVG(length), 2) AS mean_length_min
+FROM film
+GROUP BY rating
+ORDER BY mean_length_min DESC;
+
+SELECT 
+    rating, 
+    ROUND(AVG(length), 2) AS mean_length_min
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120
+ORDER BY mean_length_min DESC;
+
+SELECT last_name
+FROM actor
+GROUP BY last_name
+HAVING COUNT(*) = 1
+ORDER BY last_name;
+
+
+