Nullable Foreign Key bad practice?

Question

Let\'s say you have a table Orders with a foreign key to a Customer Id. Now, suppose you want to add an Order without a Customer Id, (whether that should be possible is anot

Answer 1

I can't see anything wrong with that it is just an optional n-1 relationship that will be represented with a null in the foreign-key. Otherwise if you put your link table then you'll have to manage that it doesn't become a n-n relationship, so causing even more trouble.