Is it possible to add a logic Constraint to a Foreign Key?

Question

I\'ve got two tables and I\'ve added a foreign key constraint. Kewl - works great. Now, is it possible to further constrain that relationship against some data in the parent

Answer 1

To give a strong guarantee, you'll need two check constraints going both ways. If you only constrain Mammals someone could update Animals.AnimalType and get the data in an inconsistent state.