Add SQL lab solutions

solution-AggregationTransformation.sql

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+USE sakila;
+
+SELECT MAX(length) AS max_duration, MIN(length) AS min_duration
+FROM film;
+
+(SELECT
+	title, length
+FROM film
+ORDER BY length DESC, title
+LIMIT 1)
+UNION ALL
+(SELECT
+	title, length
+FROM film
+ORDER BY length, title
+LIMIT 1);
+
+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
+	monthname(rental_date) AS 'rental_month',
+    dayname(rental_date) AS rental_weekday
+FROM rental
+LIMIT 20;
+
+SELECT rental_date,
+    CASE 
+		WHEN WEEKDAY(rental_date) IN (5, 6) THEN 'Weekend'
+        ELSE 'Workday'
+    END AS DAY_TYPE
+FROM rental;
+
+SELECT
+  title,
+  IFNULL(CONCAT(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) AS email_prefix
+FROM customer
+ORDER BY last_name ASC;
+
+SELECT 
+    last_name,
+    COUNT(*) AS number_last_names
+FROM actor
+GROUP BY last_name
+HAVING COUNT(*) = 1;
+
+
+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 avg_duration
+FROM film
+GROUP BY rating
+ORDER BY avg_duration DESC;
+
+SELECT rating, ROUND(AVG(length), 2) AS avg_duration
+FROM film
+GROUP BY rating
+HAVING AVG(length) > 120;
+