| From: | Chris Travers <chris(dot)travers(at)gmail(dot)com> |
|---|---|
| To: | Chip Nowacek <chip(at)twostewards(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: two-column primary key (not the typical question) |
| Date: | 2012-07-07 02:09:13 |
| Message-ID: | CAKt_ZfvB8jx+MgmqZWSHM8k17DjZWKrp+UHOEOGC+FDxUieM2g@mail.gmail.com |
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| Lists: | pgsql-general |
On Fri, Jul 6, 2012 at 7:00 PM, Chip Nowacek <chip(at)twostewards(dot)com> wrote:
> I need a suggestion. I need a two-column primary key that does not depend
> on the order of the entries. That is, for the purposes of the key:
>
> PKColA PKColB
> foo bar
> bar foo
>
What about a unique functional index which would return some sort of
ordered representation of this along with NOT NULL constraints?
I don't know if you can do it as a simple primary key, but you can probably
get unique functional indexes to do the main work for you.
Best Wishes,
Chris Travers
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