What is the difference of foreign key?

From: sheepjxx <sheepjxx(at)gmail(dot)com>
To: Postgres General Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: What is the difference of foreign key?
Date: 2009-09-24 14:19:09
Message-ID: 37a11ce00909240719n3b1b5b78q571535ef7437800b@mail.gmail.com
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To be precise,

The difference between

create table a (
foreign key (id) referenced by b(name),
);

create table b(
id integer referenced by b(name),
);

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