Re: Constraint for two fields unique any order

> I have a junction table that is recording relationships between two
> records in another table. Is there a way that I can create a constraint so
> that the values are not repeated in any order? I want to make sure that
> rows such as 2 and 4 in the example below cannot happen. This is a very
> small table that is meta data for an application. It is only 41 rows now
> and probably won't grow beyond 200 rows. I am on Postgresql ver 7.3.4 .
>
> id   fkey1   fkey2
> 1      3           4
> 2    10         4
> 3      2           7
> 4     4          10
> 5   15          8

CREATE TABLE junction
(

);