Online shopping system & online book store: Rebuild View/Edit cart and checkout pages using PL/SQL like the following: Create a function/procedure to update the quantity of the product in the cart if the new quantity is available in the store. Create a trigger that deletes the product from the cart after updating the quantity to 0. Don't forget to return the old quantity to the store. Create a trigger that empties the customer cart after the customer clicks on the checkout. Online shopping system & online book store: Rebuild View/Edit cart and checkout pages using PL/SQL like the following: Create a function/procedure to update the quantity of the product in the cart if the new quantity is available in the store. Create a trigger that deletes the product from the cart after updating the quantity to 0. Don't forget to return the old quantity to the store. Create a trigger that empties the customer cart after the customer clicks on the checkout