Re: Forcing a specific order

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От Martin Foster
Тема Re: Forcing a specific order
Дата
Msg-id 434C770B.7010606@ethereal-realms.org
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Ответ на Re: Forcing a specific order  (Tom Lane <tgl@sss.pgh.pa.us>)
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Tom Lane wrote:
> Martin Foster <martin@ethereal-realms.org> writes:
>
>>I should have been a bit more clear on the matter.   Order by is useful
>>if you want to sort the dataset a specific way using rows.  However,
>>what if I wanted to specify the order the rows are returned in using
>>information from another query?
>
>
> This sounds like you are trying to force a join order, not a specific
> tuple order.  Have you read the material about join ordering in the
> performance-tips chapter?
>
>             regards, tom lane

Honestly no.  Though I think I managed to find a quick solution for now
using a temporary table.    This cuts down massively on the rows and
makes things pretty quick and slick overall.

I will however look at it, as it might explain why I was having
troubles.   If the join could have taken place after rows were cut down,
things would have been more efficient!

Thanks!

    Martin Foster
    Creator/Designer Ethereal Realms
    martin@ethereal-realms.org


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