Thread: Primary Key with serial

Hi,


   I have the following table    create table product(cod serial, user_cod bigint, constraint product_fk Foreign Key(user_cod) references user(cod), constraint product_pk Primary Key(cod, user_cod));

What i want to happend is that:
user_cod            cod
1                         1
1                         2
1                         3
2                         1
3                         1
3                         2

Can serial do that? If not, what can  i do to make this happen?

Thanks a lot

x asasaxax wrote:
> Hi,
>
>
>    I have the following table    create table product(cod serial, user_cod
> bigint, constraint product_fk Foreign Key(user_cod) references user(cod),
> constraint product_pk Primary Key(cod, user_cod));
>
> What i want to happend is that:
> user_cod            cod
> 1                         1
> 1                         2
> 1                         3
> 2                         1
> 3                         1
> 3                         2
>
> Can serial do that?

No, a serial type will always be unique.

> If not, what can  i do to make this happen?

Re-evaluate your schema. Why do you want these two columns to have such
a relationship? If it's very important, don't use a serial for cod and
have your application figure out the value to assign.

b

x asasaxax wrote:
>    I have the following table    create table product(cod serial, user_cod
> bigint, constraint product_fk Foreign Key(user_cod) references user(cod),
> constraint product_pk Primary Key(cod, user_cod));
>
> What i want to happend is that:
> user_cod            cod
> 1                         1
> 1                         2
> 1                         3
> 2                         1
> 3                         1
> 3                         2
>
 > Can serial do that? ...

No.

 > ...what can  i do to make this happen?


http://archives.postgresql.org/pgsql-general/2006-08/msg00744.php