Re: Ordering Results by a Supplied Order

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От Rémi Cura
Тема Re: Ordering Results by a Supplied Order
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Msg-id CAJvUf_txfY+JosctEcbxDnKa6Cr6V9COoWU1LOD2j=bjMre2_g@mail.gmail.com
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Ответ на Re: Ordering Results by a Supplied Order  (Vik Fearing <vik.fearing@dalibo.com>)
Ответы Re: Ordering Results by a Supplied Order  (Vik Fearing <vik.fearing@dalibo.com>)
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Hey,
 I don"t understand the difference between this ORDINALITY option and adding a "row_number() over()" in the SELECT.

Thanks,

Cheers,
Remi-C


2014-02-06 Vik Fearing <vik.fearing@dalibo.com>:
On 02/06/2014 04:16 AM, Michael Sacket wrote:
Often times I find it necessary to work with table rows in a specific, generally user-supplied order.  It could be anything really that requires an ordering that can't come from a natural column.  Most of the time this involved manipulating a position column from the client application.  In any case, I've often found that to be cumbersome, but I think I've come up with a solution that some of you may find useful.  


Up until 9.4, that's a good way to do it.

Starting from 9.4, you can use the WITH ORDINALITY feature.
http://www.postgresql.org/docs/devel/static/sql-select.html
-- 
Vik

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