Re: PRIMARY KEY and UNIQUE

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@postgresql.org
>[mailto:pgsql-general-owner@postgresql.org]On Behalf Of Andrew Gould
>Sent: Thursday, February 14, 2002 10:31 AM
>To: ambre@ebutec.com; pgsql-general@postgresql.org
>Subject: Re: [GENERAL] PRIMARY KEY and UNIQUE
>
>
>--- Erwin Ambrosch <ambre@ebutec.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
>
>
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