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(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
>
>
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