MySQL 5.7 has a lot of new features. If you've dabbled with an older version of MySQL, it is definitely worth learning.
CREATE PROCEDURE UpdateInventory (@OrderID int, @CartID char (36)) AS DECLARE @Quantity INT SELECT @Quantity = ShoppingCart.Quantity FROM ShoppingCart INNER JOIN Product ON ShoppingCart.ProductID = Product.ProductID WHERE ShoppingCart.CartID = @CartID UPDATE Product SET Inventory = (Inventory - @Quantity) WHERE ShoppingCart.ProductID = Product.ProductID
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