From: Bart Degryse <Bart.Degryse@indicator.be>
To: pgsql-sql@postgresql.org
Subject: Re: How to have a unique primary key on two tables
Date: Thu, 22 Nov 2007 12:11:20 +0100
Message-ID: <474571E8.A3DD.0030.0@indicator.be> (raw)
In-Reply-To: <99d8c2310711220301p57c9b7c5i4620a7e658d13b7d@mail.gmail.com>
References: <99d8c2310711220301p57c9b7c5i4620a7e658d13b7d@mail.gmail.com>
When you use serial a kind of macro is performed: in fact an integer field is created, a sequence is created with a name based on the table's name and the nextval of that sequence is used as the default value for the field. Now you have to do these steps "manually".
CREATE SEQUENCE "public"."tbl_all_ID_seq" INCREMENT 1 MINVALUE 1 START 1 CACHE 1;
CREATE TABLE tbl_first (
id INTEGER DEFAULT nextval('public."tbl_all_ID_seq"'::text) NOT NULL,
testo text
);
CREATE TABLE tbl_second (
id INTEGER DEFAULT nextval('public."tbl_all_ID_seq"'::text) NOT NULL,
testo text
);
>>> "Daniel "bodom_lx" Graziotin" <daniel.graziotin@gmail.com> 2007-11-22 12:01 >>>
Hi everybody,
I need to have a primary key which has to be unique on two tables.
E.g.:
CREATE TABLE first
(
id serial NOT NULL,
testo text,
)
CREATE TABLE second
(
id serial NOT NULL,
testo text,
)
When I insert some text on "first", I would like first.id = second.id
+ 1, and vice versa.
A sort of primary key in common for both tables.
Any hints?
Thank you very much
--
Daniel "bodom_lx" Graziotin
- http://daniel.graziotin.net ( http://daniel.graziotin.net/ )
- http://daniel.graziotin.net/bodom_lx.asc - GPG public key
---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faq
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: Bart.Degryse@indicator.be
Subject: Re: How to have a unique primary key on two tables
In-Reply-To: <474571E8.A3DD.0030.0@indicator.be>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox