Re: PRIMARY KEY and UNIQUE

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От
Darren Ferguson
Тема
Re: PRIMARY KEY and UNIQUE
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Msg-id
Pine.LNX.4.10.10202141028210.3159-100000@thread.crystalballinc.com
Ответ на
PRIMARY KEY and UNIQUE (Erwin Ambrosch)
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Дерево обсуждения
PRIMARY KEY and UNIQUE Erwin Ambrosch <ambre@ebutec.com>
Re: PRIMARY KEY and UNIQUE Andrew Gould <andrewgould@yahoo.com>
Re: PRIMARY KEY and UNIQUE "Liam DeMasi" <ldemasi@acsinc-nj.com>
Re: PRIMARY KEY and UNIQUE Andrew Gould <andrewgould@yahoo.com>
Re: PRIMARY KEY and UNIQUE Darren Ferguson <darren@crystalballinc.com>
Re: PRIMARY KEY and UNIQUE Martín Marqués <martin@bugs.unl.edu.ar>
Re: PRIMARY KEY and UNIQUE Martín Marqués <martin@bugs.unl.edu.ar>
If it is a primary key then it will automatically be UNIQUE.

You do not need the unique next to the VARCHAR in this situation

Darren

On Thu, 14 Feb 2002, Erwin Ambrosch 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
> 
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