Re: Constrain duplicate patterns

Russell Shaw wrote:
> Hi,
>
> Is there a way to make postgresql report an error if when
> inserting data, a multiple-column combination is duplicated?
>
> CREATE TABLE parts_vendors (
>     part_id integer references parts (part_id),
>     vendor_id integer references vendors (vendor_id),
>     ...
> )
>
> part_id  vendor_id
> ------------------
> 1        3
> 2        5 <--+
> 7        9    |
> 2        5 <--+-- duplicate pattern
> ...
>

Oops, i can just do a select on the various columns
to detect this...