Tom Lane  wrote:
 
< NOT NULL constraints at the domain level suck. Don't use 'em.
 
+1
 
As someone who uses domains very heavily, I can attest that the
semantics of that are very weak.  Whether a domain is nullable
depends almost entirely on the context of its use, which you can't
(and shouldn't try to) anticipate on its declaration.
 
-Kevin

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