solved

sakila_joins_lab.sql

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+USE sakila;
+SHOW TABLES;
+
+
+
+
+SELECT *
+FROM film_category;
+
+SELECT *
+FROM category;
+
+
+
+SELECT
+c.category_id,
+c.name,
+COUNT(fc.film_id) AS num_films
+FROM film_category AS fc
+INNER JOIN category AS c
+ON fc.category_id = c.category_id
+GROUP BY
+c.category_id,
+c.name;
+
+
+SELECT*
+FROM store;
+
+SELECT*
+FROM city;
+
+SELECT*
+FROM address;
+
+SELECT*
+FROM country;
+
+SELECT
+s.store_id,
+a.address_id,
+c.city_id,
+co.country_id
+FROM store AS s
+LEFT JOIN address AS a
+ON s.address_id = a.address_id
+LEFT JOIN city AS c
+ON a.city_id = c.city_id
+LEFT JOIN country AS co
+ON c.country_id = co.country_id;
+
+
+
+
+SELECT*
+FROM store;   -- store id
+
+SELECT*
+FROM payment; -- amount
+
+SELECT*
+FROM staff; -- address id
+
+SELECT
+s.store_id,
+SUM(p.amount) AS total_revenue
+FROM store AS s
+JOIN staff AS st
+ON s.store_id = st.store_id
+JOIN payment AS p
+ON st.staff_id = p.staff_id
+GROUP BY
+s.store_id;
+
+
+
+
+SELECT *
+FROM film_category;
+
+SELECT *
+FROM category;
+
+SELECT *
+FROM film;
+
+SELECT
+fc.category_id,
+c.name,
+AVG(f.length) AS avg_length
+FROM film AS f
+LEFT JOIN film_category AS fc
+ON f.film_id = fc.film_id
+LEFT JOIN category AS c
+ON fc.category_id = c.category_id
+GROUP BY
+fc.category_id,
+c.name
+ORDER BY fc.category_id;
+
+
+SELECT
+fc.category_id,
+c.name,
+AVG(f.length) AS avg_length
+FROM film AS f
+LEFT JOIN film_category AS fc
+ON f.film_id = fc.film_id
+LEFT JOIN category AS c
+ON fc.category_id = c.category_id
+GROUP BY
+fc.category_id,
+c.name
+ORDER BY avg_length DESC;
+
+
+SELECT *
+FROM film;
+
+SELECT *
+FROM inventory;
+
+SELECT *
+FROM rental;
+
+SELECT
+f.title,
+COUNT(rental_id) AS num_rented
+FROM film AS f
+JOIN inventory AS i
+ON f.film_id = i.film_id
+JOIN rental AS r
+ON i.inventory_id = r.inventory_id
+GROUP BY f.title
+ORDER BY num_rented DESC
+LIMIT 10;
+
+
+SELECT *
+FROM film;
+
+SELECT *
+FROM inventory;
+
+SELECT *
+FROM store;
+
+SELECT
+s.store_id
+FROM film AS f
+JOIN inventory AS i
+ON f.film_id = i.film_id
+JOIN store AS s
+ON i.store_id = s.store_id
+WHERE f.title = "Academy Dinosaur" AND s.store_id = 1;
+
+
+SELECT
+    f.title,
+    CASE
+        WHEN IFNULL(COUNT(i.inventory_id), 0) > 0 THEN 'AVAILABLE'
+        ELSE 'NOT AVAILABLE'
+    END AS availability
+FROM film AS f
+LEFT JOIN inventory AS i
+    ON f.film_id = i.film_id
+GROUP BY
+    f.title;
+
+
+