Tom Lane wrote:
> mvppetlab@yahoo.com (Chris) writes:
>>My question is: is it possible to use pure SQL to return a result set
>>that would make rendering a threaded view like the above really easy?
>
> What you're really after is a tree structure. This is relatively easy
> to do with Oracle's CONNECT BY or SQL99's WITH, neither of which we have
> in Postgres (yet). I think in bog-standard SQL92 you can't readily do
> it without adding some additional fields to the table.
>
> I highly recommend you buy a copy of Joe Celko's "SQL For Smarties".
> He has two whole chapters on different ways to handle trees in SQL.
In the short term, if you don't mind a Postgres specific answer, you
could also take a look at contrib/tablefunc for a function called
connectby().
HTH,
Joe
