Re: Ordering Results by a Supplied Order
| От | Rémi Cura |
|---|---|
| Тема | Re: Ordering Results by a Supplied Order |
| Дата | |
| Msg-id | CAJvUf_txfY+JosctEcbxDnKa6Cr6V9COoWU1LOD2j=bjMre2_g@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Ordering Results by a Supplied Order (Vik Fearing <vik.fearing@dalibo.com>) |
| Ответы |
Re: Ordering Results by a Supplied Order
|
| Список | pgsql-general |
Hey,
I don"t understand the difference between this ORDINALITY option and adding a "row_number() over()" in the SELECT.Remi-C
2014-02-06 Vik Fearing <vik.fearing@dalibo.com>:
Up until 9.4, that's a good way to do it.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.
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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