diff --git a/lab_3.1.sql b/lab_3.1.sql
new file mode 100644
index 0000000..5440bcb
--- /dev/null
+++ b/lab_3.1.sql
@@ -0,0 +1,82 @@
+-- 1
+select count(*) as number_of_film, category.name
+from film_category
+join category 
+on film_category.category_id = category.category_id
+group by 2;
+
+-- 2 
+select s.store_id, ci.city, co.country
+from store as s
+join address as ad
+on s.address_id = ad.address_id
+join city as ci
+on ad.city_id = ci.city_id
+join country as co
+on ci.country_id = co.country_id;
+
+-- 3
+select sta.store_id, sum(p.amount) as revenue_genered
+from payment as p
+join staff as sta
+on p.staff_id = sta.staff_id
+join store as sto
+on sta.staff_id = sto.manager_staff_id
+group by 1;
+
+-- 4
+select round(avg(f.length),2) as running_time, c.name
+from film as f
+join film_category as fc
+on f.film_id = fc.film_id
+join category as c
+on fc.category_id = c.category_id
+group by 2;
+
+-- bonus
+-- 5
+select round(avg(f.length),2) as running_time, c.name
+from film as f
+join film_category as fc
+on f.film_id = fc.film_id
+join category as c
+on fc.category_id = c.category_id
+group by 2
+order by 1 desc
+limit 1;
+
+-- 6
+select count(re.inventory_id) as number_of_rental, f.title
+from rental as re
+join inventory as inv
+on re.inventory_id = inv.inventory_id
+join film as f
+on inv.film_id = f.film_id
+group by 2
+order by 1 desc
+limit 10;
+
+-- 7
+select title, store_id
+from film as f
+join inventory as inv
+on f.film_id = inv.film_id
+where title = 'ACADEMY DINOSAUR';
+-- here we can see that "Academy Dinosaur" can be rented in both store
+
+-- 8 distinct film, available ?(inventory)
+select distinct(f.title), case
+when inv.film_id is not null then 'Available'
+when inv.film_id is null then 'Not Available'
+end as is_available
+from film as f
+left join inventory as inv
+on f.film_id = inv.film_id;
+
+
+
+
+
+
+
+