"Richard Broersma" <richard.broersma@gmail.com> writes:
> For this reason, clients passing natural joins to the server can have
> dangerous result sets returned with no warning.
Yeah. A lot of people consider that NATURAL JOIN is simply a bad idea
and shouldn't be used ever --- it's too easy to shoot yourself in the
foot with a careless column addition or rename. Explicitly spelling out
the join columns with ON or USING is a lot less prone to silent breakage
after a schema change.
regards, tom lane