Re: Duplicate deletion optimizations

Поиск
Список
Период
Сортировка
От Misa Simic
Тема Re: Duplicate deletion optimizations
Дата
Msg-id -1818149885061307584@iso-8859-1msgid
обсуждение исходный текст
Ответ на Duplicate deletion optimizations  (antoine@inaps.org)
Список pgsql-performance
It was not query... Just sentence where some index values in one table
not exist in another...

So query could be with:
• WHERE (col1,col2,col2) NOT IN
• WHERE NOT EXISTS
• LEFT JOIN live USING (col1,col2,col2) WHERE live.id IS NULL

what ever whoever prefer more or what gives better results... But I
think it is more personal feelings which is better then real...

Sent from my Windows Phone
From: Jochen Erwied
Sent: 07/01/2012 15:18
To: Misa Simic
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Duplicate deletion optimizations
Saturday, January 7, 2012, 3:02:10 PM you wrote:

> • insert into live from temp where col1, col2 and col3 not exists in
> live

'not exists' is something I'm trying to avoid, even if the optimizer is
able to handle it.

--
Jochen Erwied     |   home: jochen@erwied.eu     +49-208-38800-18, FAX: -19
Sauerbruchstr. 17 |   work: joe@mbs-software.de  +49-2151-7294-24, FAX: -50
D-45470 Muelheim  | mobile: jochen.erwied@vodafone.de       +49-173-5404164

В списке pgsql-performance по дате отправления:

Предыдущее
От: Marc Eberhard
Дата:
Сообщение: Re: Duplicate deletion optimizations
Следующее
От: "Pierre C"
Дата:
Сообщение: Re: Duplicate deletion optimizations