Re: How foreign key info is stored

On Thursday, April 17, 2003, at 02:41 PM, Tom Lane wrote:

> Ken Williams <ken(at)mathforum(dot)org> writes:
>> 1) In postgres 7.1.3, how can I access the foreign key relationships
>> among tables?
>
> The only way is to reverse-engineer it from the contents of pg_trigger.
> 7.3's contrib/adddepend will help you with this.

Okay, thanks. Is there any documentation for the pg_trigger table? It
seems to be missing from

http://www.postgresql.org/docs/
view.php?version=7.1&idoc=1&file=catalogs.html

If there are no docs, I can probably reverse-engineer the
reverse-engineering from findForeignKeys() in the adddepend script.

>> 2) Is foreign key definition working properly via 'ALTER TABLE <table>
>> ADD ...' in 7.3.2?
>
> No, there's a bug there --- ALTER ADD COLUMN neglects to process any
> foreign-key clauses you might have written. This is fixed for 7.3.3.

Thanks.

-Ken