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%.
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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%.