Bruno Wolff III wrote:
>On Wed, May 26, 2004 at 05:13:14 +0200,
> Andreas <maps.on@gmx.net> wrote:
>
>
>>Is there a way to have something like this : UNIQUE (table_1.id,
>>table_2.xxx)
>>
>>
>
>Postgres doesn't support database constraints at this time which is
>what you would need to do this simply.
>
>
Well, a simple way was to have a table_1-foreign key in the table 2.
I just thought since there is:
table_1 <--1:n-- table_x <--1:n-- table_2
and I hoped not having to add
table_1 <--1:n-- table_2
just to have uniquness of an attribute of table_2 and the key of table_1
>You can enforce this constraint by creating a third table
>
That is more efford than to stuff the column into table_2.
Thanks anyway ;)
