From: Devrim GUNDUZ <devrim@gunduz.org>
To: Nosyman <nosyman@easymail.ro>
Cc: pgsql-sql@postgresql.org
Subject: Re: PRIMARY KEY and INDEX
Date: Thu, 2 Sep 2004 17:48:35 +0300 (EEST)
Message-ID: <Pine.LNX.4.61.0409021747590.1213@emo.org.tr> (raw)
In-Reply-To: <200409021358.i82DwGQ8022806@acten.itcnet.ro>
References: <200409021358.i82DwGQ8022806@acten.itcnet.ro>
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Hi,
On Thu, 2 Sep 2004, Nosyman wrote:
> It is necessary to define an index for a primary key column?
>
> Let's have an example
> CREATE TABLE users(
> id_user INTEGER PRIMARY KEY,
> user_name VARCHAR(25)
> );
>
> Does PgSQL automatically create an index for id_user (primary key) or it
> must be created by hand?
You could give it a try before asking:
test=# CREATE TABLE users(
test(# id_user INTEGER PRIMARY KEY,
test(# user_name VARCHAR(25)
test(# );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"users_pkey" for table "users"
CREATE TABLE
Regards,
- --
Devrim GUNDUZ
devrim~gunduz.org devrim.gunduz~linux.org.tr
http://www.tdmsoft.comhttp://www.gunduz.org
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To: pgsql-sql@postgresql.org
Cc: devrim@gunduz.org, nosyman@easymail.ro
Subject: Re: PRIMARY KEY and INDEX
In-Reply-To: <Pine.LNX.4.61.0409021747590.1213@emo.org.tr>
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