From: Chris <dmagick@gmail.com>
To: A. Kretschmer <andreas.kretschmer@schollglas.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: update query taking too long
Date: Thu, 28 Jun 2007 16:37:43 +1000
Message-ID: <46835737.8090307@gmail.com> (raw)
In-Reply-To: <20070628062826.GC22066@a-kretschmer.de>
References: <46834124.5010600@gmail.com>
<21072.1183009270@sss.pgh.pa.us>
<46835252.5070901@gmail.com>
<20070628062826.GC22066@a-kretschmer.de>
A. Kretschmer wrote:
> am Thu, dem 28.06.2007, um 16:16:50 +1000 mailte Chris folgendes:
>> Is there a better way to write the update? I thought about something
>> like this (but couldn't get it working - guess I don't have the right
>> syntax):
>>
>> update t1 set domainname=(select id, SUBSTRING(emailaddress FROM
>> POSITION('@' IN emailaddress)) from table t2) AS t2 where t1.id=t2.id
>
> test=# select * from foo;
> id | mail | domain
> ----+-------------+--------
> 1 | foo@foo.tld |
> 2 | bar@bar.tld |
> (2 rows)
>
> test=*# update foo set domain=SUBSTRING(mail FROM (POSITION('@' IN
> mail)+1));
That's what my original query is (apart from the +1 at the end) ;)
I was just trying to approach it differently with the other attempt.
--
Postgresql & php tutorials
http://www.designmagick.com/
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To: pgsql-performance@postgresql.org
Cc: dmagick@gmail.com, andreas.kretschmer@schollglas.com
Subject: Re: update query taking too long
In-Reply-To: <46835737.8090307@gmail.com>
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