What are the product that have been booked?
select distinct product_id from products_booked
Show me the one with booked amount 102.76.
select product_id from products_booked where booked_amount = 102.76
What about its description?
select t2.product_description from products_booked as t1 join products_for_hire as t2 on t1.product_id = t2.product_id where t1.booked_amount = 102.76