From the SalesOrders database, retrieve the concatenated Last Name and First Name and the total of all products$/$orders each customer has spent. Sort the list of customers descending by the total spent.

This will require $3$ tables. The subquery will need to join $2$ tables and will contain both an $$on$$ clause and a $$where$$ clause. QuotedPrice$*$QuantityOrdered is the cost of each product on the order.