Обсуждение: Create Table

Hi All,

I know it is a really single question, but I am without any
reference... Does anyone can help me ?

I have to tables (example): 'seller' and 'sells'

seller:

CodSeller | NameSeller
----------------------
   1435   | Mark
   2486   | Tim

Sells:

CodSell | CodSeller | Description
---------------------------------
  001   |   1435    | xya sfaks
  002   |   2486    | sdf sdfsd

So, I can create seller like:

create table seller (codseller integer, nameseller char(35));

My question is how to create 'Sells' and link it with 'Seller', can I
force delete cascades with this relation ?

Thanks in Advance,

See ya,

Marcelo

Marcelo Pereira wrote:
>
> Hi All,
>
> I know it is a really single question, but I am without any
> reference... Does anyone can help me ?
>
> I have to tables (example): 'seller' and 'sells'
>
> seller:
>
> CodSeller | NameSeller
> ----------------------
>    1435   | Mark
>    2486   | Tim
>
> Sells:
>
> CodSell | CodSeller | Description
> ---------------------------------
>   001   |   1435    | xya sfaks
>   002   |   2486    | sdf sdfsd
>
> So, I can create seller like:
>
> create table seller (codseller integer, nameseller char(35));
>
> My question is how to create 'Sells' and link it with 'Seller', can I
> force delete cascades with this relation ?

How about:

create table seller (
codseller integer unique not null,
nameseller varchar(35) not null
);

create table sells (
codsell integer unique not null,
codseller integer references seller(codseller) on delete cascade,
description varchar(35) not null);

Hope that helps,

Mike Mascari
mascarm@mascari.com

>
> Thanks in Advance,
>
> See ya,
>
> Marcelo

On Mar 13 Nov 2001 10:33, you wrote:
> Hi All,
>
> I know it is a really single question, but I am without any
> reference... Does anyone can help me ?
>
> I have to tables (example): 'seller' and 'sells'
>
> seller:
>
> CodSeller | NameSeller
> ----------------------
>    1435   | Mark
>    2486   | Tim
>
> Sells:
>
> CodSell | CodSeller | Description
> ---------------------------------
>   001   |   1435    | xya sfaks
>   002   |   2486    | sdf sdfsd
>
> So, I can create seller like:
>
> create table seller (codseller integer, nameseller char(35));
>
> My question is how to create 'Sells' and link it with 'Seller', can I
> force delete cascades with this relation ?

CREATE TABLE sells (
    codsell INT, -- could be serial
    codseller INT REFERENCES seller ("CodSeller"),
    Description CHAR(60)
);

Saludos... :-)


--
Porqué usar una base de datos relacional cualquiera,
si podés usar PostgreSQL?
-----------------------------------------------------------------
Martín Marqués                  |        mmarques@unl.edu.ar
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
-----------------------------------------------------------------