Peter Eisentraut <peter_e@gmx.net> writes:
> <kibo>
> "The <search condition> shall simply contain a <boolean value
> expression> that is retrospectively deterministic."
> This is then defined in a rather complex manner that ends up disallowing
> col > now() but allowing col < now().
> </kibo>
Oh, cute. Seems to have been added in SQL:2003. I guess somebody
nagged them about wanting to be able to write CHECK(col <= now()).
The detailed definition is amazingly laborious and yet limited, though,
as it basically doesn't address the problem except for that specific
case and close relatives.
regards, tom lane