Re: ordering of selected rows from an ordered subselect

Поиск
Список
Период
Сортировка
От Andrew Sullivan
Тема Re: ordering of selected rows from an ordered subselect
Дата
Msg-id 20070217152434.GA3623@phlogiston.dyndns.org
обсуждение исходный текст
Ответ на ordering of selected rows from an ordered subselect  ("Rajesh Kumar Mallah" <mallah.rajesh@gmail.com>)
Список pgsql-sql
On Sat, Feb 17, 2007 at 03:02:06PM +0530, Rajesh Kumar Mallah wrote:
> 
> select   id , name , expensive_func(name)  from
>        ( select id , name from tab  order by c1 desc limit 15)  as foo ;
> 
> is it guaranteed that the final result is order by c1 ?

No, because expensive_func(name) might do something that alters it,
no?  All things considered, it's a pretty good _bet_ it will be
ordered as you wish, though.

A

-- 
Andrew Sullivan  | ajs@crankycanuck.ca
The whole tendency of modern prose is away from concreteness.    --George Orwell


В списке pgsql-sql по дате отправления:

Предыдущее
От: "A. Kretschmer"
Дата:
Сообщение: Re: sub-limiting a query
Следующее
От: Tom Lane
Дата:
Сообщение: Re: ordering of selected rows from an ordered subselect