Re: update query taking too long

[Chris <dmagick(at)gmail(dot)com>]

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.

--
Postgresql & php tutorials
http://www.designmagick.com/