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

Yes theres something wrong. Its not a foreign key if its nullable. Its database design by code. Maybe you make a zero link to unassigned. or "Unassigned" if your using a character col. Keep the integrity of your data 100%.