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To: Tobias Brox <tobias@nordicbet.com>
Cc: Arnaud Lesauvage <thewild@freesurf.fr>,
	pgsql-performance@postgresql.org
Subject: Re: Poor performance on very simple query ?
References: <45224896.7040708@freesurf.fr> <20061003121004.GC30211@oppetid.no>
	<20061003121109.GD30211@oppetid.no> <45225407.7090805@freesurf.fr>
	<20061003121709.GF30211@oppetid.no>
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From: Guillaume Cottenceau <gc@mnc.ch>
Date: 03 Oct 2006 14:27:40 +0200
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Tobias Brox <tobias 'at' nordicbet.com> writes:

> Oh - it is.  How can you have a default value on a primary key?  Will it

you can but it is useless :)

foo=# create table bar (uid int primary key default 0, baz text);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "bar_pkey" for table "bar"
CREATE TABLE
foo=# insert into bar (baz) values ('');
INSERT 217426996 1
foo=# insert into bar (baz) values ('');
ERROR:  duplicate key violates unique constraint "bar_pkey"

-- 
Guillaume Cottenceau
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