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+
+join_exercises.sql
diff --git a/join_lab.sql b/join_lab.sql
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+USE sakila;
+
+# 7 Determine if "Academy Dinosaur" can be rented from Store 1.
+# 8 Provide a list of all distinct film titles, along with their availability status in the inventory. 
+# Include a column indicating whether each title is 'Available' or 'NOT available.'
+# Note that there are 42 titles that are not in the inventory, and this information can be obtained using a CASE statement combined with IFNULL."
+
+# 1 List the number of films per category.
+SELECT COUNT(FM.film_id), FM.category_id, C.name
+FROM film_category AS FM
+JOIN category AS C
+USING(category_id)
+GROUP BY category_id;
+
+# 2 Retrieve the store ID, city, and country for each store.
+SELECT S.store_id, CI.city, CO.country
+FROM store AS S
+JOIN address AS A
+USING (address_id)
+JOIN city AS CI
+USING (city_id)
+JOIN country AS CO
+USING (country_id);
+
+# 3 Calculate the total revenue generated by each store in dollars
+SELECT S.store_id, SUM(P.amount) AS total_revenue
+FROM staff AS S
+JOIN payment AS P 
+USING(staff_id)
+GROUP BY store_id; 
+
+# 4 Determine the average running time of films for each category
+SELECT FC.category_id AS "cat_id", AVG(F.length) AS 'avg_running_time'
+FROM film AS F
+JOIN film_category AS FC
+USING (film_id)
+GROUP BY cat_id;
+
+###############################################   Bonus:   #################################################################################
+# 5 Identify the film categories with the longest average running time.
+SELECT C.category_id, C.name, AVG(F.length) AS Average_length
+FROM category AS C
+JOIN film_category AS FC
+USING (category_id)
+JOIN film AS F
+USING (film_id)
+GROUP BY C.category_id, C.name
+ORDER BY AVG(length) DESC;
+
+# 6 Display the top 10 most frequently rented movies in descending order.
+
+SELECT F.film_id, F.title, COUNT(rental_id) AS 'Frequency'
+FROM film AS F
+JOIN inventory AS I
+USING (film_id)
+JOIN rental AS R
+USING (inventory_id)
+GROUP BY F.film_id
+ORDER BY COUNT(rental_id) DESC
+LIMIT 10; 
+
+