Re: Question on PostgreSQL DB behavior w.r.t JOIN and sort order.

On Monday, February 8, 2016, Rob Sargent <robjsargent(at)gmail(dot)com> wrote:

> On 02/08/2016 10:53 PM, Venkatesan, Sekhar wrote:
>
> Yes. is there an option/configuration to tell the postgres
> optimizer/planner to generate plans to include the sort order instead of
> speed?
>
>
>
> *From:* David G. Johnston [mailto:david(dot)g(dot)johnston(at)gmail(dot)com
> <javascript:_e(%7B%7D,'cvml','david(dot)g(dot)johnston(at)gmail(dot)com');>]
> *Sent:* Tuesday, February 09, 2016 11:20 AM
> *To:* Venkatesan, Sekhar
> *Cc:* Tom Lane; pgsql-sql(at)postgresql(dot)org
> <javascript:_e(%7B%7D,'cvml','pgsql-sql(at)postgresql(dot)org');>
> *Subject:* Re: [SQL] Question on PostgreSQL DB behavior w.r.t JOIN and
> sort order.
>
>
>
> On Monday, February 8, 2016, Venkatesan, Sekhar <sekhar(dot)venkatesan(at)emc(dot)com
> <javascript:_e(%7B%7D,'cvml','sekhar(dot)venkatesan(at)emc(dot)com');>> wrote:
>
> Is there a way to tell the optimizer to retain the sort order if that is
> possible please?
>
>
>
>
>
> You mean, besides the ORDER BY clause?
>
>
>
> David J.
>
> Which order would that be?
>
>
I presume the order of the joining column(s) given the subject. Not that
it matters but I don't know how generalized the OP expects such a mechanic
to ultimately function, or thinks it does from limited observations in a
different database product.

David J.