Re: where clause subqueries vs multiple rows results

Oops, see correction below...

On 9/10/06, Aaron Bono <postgresql(at)aranya(dot)com> wrote:
>
> On 9/10/06, James Cloos <cloos(at)jhcloos(dot)com> wrote:
>
> > I've a query which I'd have liked to word akin to:
> >
> > SELECT guid FROM child WHERE the_fkey =
> > ( SELECT id FROM parent WHERE name ~ 'some_regex' )
> > ORDER BY the_fkey, my_pkey;
> >
> > I got around it by doing the SELECT id first, and then doing a SELECT
> > guid for each row returned, appending the results together.
> >
> > Can that be done in a single query, insead of 1+n queries?
>
>
>
> Will this work?
>
> SELECT guid
> FROM child
> INNER JOIN parent ON (
> child.the_fkey = parent.id
> )
> WHERE name ~ 'some_regex'
> ORDER BY
> child.the_fkey,
> child.my_pkey
> ;
>
> I am not sure what table name is from but since you say it is n+1 queries
> I assume it is from the child table? It would help to know what columns are
> on which tables.
>
> ==================================================================
> Aaron Bono
> Aranya Software Technologies, Inc.
> http://www.aranya.com
> http://codeelixir.com
> ==================================================================
>

--
==================================================================
Aaron Bono
Aranya Software Technologies, Inc.
http://www.aranya.com
http://codeelixir.com
==================================================================