From: | "Liam DeMasi" <ldemasi(at)acsinc-nj(dot)com> |
---|---|
To: | "'Andrew Gould'" <andrewgould(at)yahoo(dot)com>, <ambre(at)ebutec(dot)com>, <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: PRIMARY KEY and UNIQUE |
Date: | 2002-02-14 16:09:22 |
Message-ID: | 000001c1b571$f88badc0$0c00a8c0@netconnect12 |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Andrew,
I thought that just by declaring the field the Primary Key makes it
automatically NOT NULL and UNIQUE?
Am I wrong?
Liam
>-----Original Message-----
>From: pgsql-general-owner(at)postgresql(dot)org
>[mailto:pgsql-general-owner(at)postgresql(dot)org]On Behalf Of Andrew Gould
>Sent: Thursday, February 14, 2002 10:31 AM
>To: ambre(at)ebutec(dot)com; pgsql-general(at)postgresql(dot)org
>Subject: Re: [GENERAL] PRIMARY KEY and UNIQUE
>
>
>--- Erwin Ambrosch <ambre(at)ebutec(dot)com> wrote:
>> Hi,
>>
>> I have a such a table.
>>
>> CREATE TABLE int_article (
>> name VARCHAR(12) UNIQUE
>> headline TEXT,
>> summary TEXT,
>> main TEXT,
>> footer TEXT,
>> PRIMARY KEY (name)
>> );
>>
>> Is the UNIQUE constraint neccessary, because if have
>> specified the column
>> name to be the primary key.
>>
>> Thanks in advance
>> Erwin
>
>No; but if you eliminate 'UNIQUE', you'll need to
>replace it with 'NOT NULL'.
>
>Andrew Gould
>
>
>__________________________________________________
>Do You Yahoo!?
>Send FREE Valentine eCards with Yahoo! Greetings!
>http://greetings.yahoo.com
>
>---------------------------(end of
>broadcast)---------------------------
>TIP 2: you can get off all lists at once with the unregister command
> (send "unregister YourEmailAddressHere" to
>majordomo(at)postgresql(dot)org)
>
From | Date | Subject | |
---|---|---|---|
Next Message | Hiroshi Inoue | 2002-02-14 16:53:17 | Re: [GENERAL] Postgres 7.2 - Updating rows in cursor problem |
Previous Message | Jan Wieck | 2002-02-14 16:03:13 | Re: TPC-H |