From: Ludwig Lim <lud_nowhere_man@yahoo.com>
To: PostgreSQL Mailing List <pgsql-sql@postgresql.org>
Subject: Some Questions
Date: Thu, 12 Jun 2003 05:18:35 -0700 (PDT)
Message-ID: <20030612121835.66802.qmail@web80507.mail.yahoo.com> (raw)
Hi:
I would like to ask the following questions:
a) Are foreign key constraint triggers guaranteed to
execute first before any ordinary "BEFORE
INSERT/UPDATE/DELETE" trigger is executed? (This is
assuming that the foreign keys are declared as "NOT
DEFERRABLE")
b) Is "varchar" (without upper limit) the same as
"text"?
I do notice that when I create a view :
create view v_test as (select 'test'::varchar(10)
union select 'test1'::varchar(10));
a "\d v_test" on the psql prompt would always say
the only only column the view is of type "character
varying". Does a union of a varchar(n) column and a
another varchar(n) column would automatically cast it
to "character varying" (w/o upper limit) even if the
upper limit of the 2 varchar columns are the same?
thanks in advance,
ludwig lim
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To: pgsql-sql@postgresql.org
Cc: lud_nowhere_man@yahoo.com
Subject: Re: Some Questions
In-Reply-To: <20030612121835.66802.qmail@web80507.mail.yahoo.com>
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