From: | Chris <dmagick(at)gmail(dot)com> |
---|---|
To: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: update query taking too long |
Date: | 2007-06-28 06:37:43 |
Message-ID: | 46835737.8090307@gmail.com |
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Thread: | |
Lists: | pgsql-performance |
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(at)foo(dot)tld |
> 2 | bar(at)bar(dot)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.
--
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