What are all the services with product name "film"?
select * from services where product_name = "film"
What are the names of workshop groups in which they are performed?
select t1.store_phone, t1.store_email_address from drama_workshop_groups as t1 join services as t2 on t1.workshop_group_id = t2.workshop_group_id where t2.product_name = "film"