From: MichaelHoeller@t-online.de
Reply-To: Michael Hoeller <MichaelHoeller@t-online.de>
To: pgsql-sql@postgresql.org
Subject: Re: how to update with a join?
Date: Sat, 10 Sep 2005 18:56:10 +0200
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Hello all,

thanks for the answere to the prev. thread.  With the help of them 
I solved the problme I used "not like" instead of <> and this leads 
to a problem. This works for me: 

update stamm 
set code = replace (code, 'k' , '')
where code like '%k%' and code <> '%V%';

I would still be interested to learn how to update a row when the result 
set is only reachable via a join.

Thanks a gain
Michael


Michael Hoeller wrote at Samstag, 10. September 2005 18:47:
> Hello
>
> I like to delete "k" from a string with the statement
> update stamm set code = replace (code, 'k' , '');
>
> But the only way to get the canditates I want to update is the
> following statement. It seems that I can not update when I do a join.
>
> Is there a way around it? With google I found a hint that a subselect
> could help but there was no exsample ... And I did not found out how
> to do this.
>
> select a.code
> from stamm a
> where
> a.skart in (
> 	(select skart
> 	from stamm
> 	where code like '%k%')
> 	)
> and a.code not like '%V%';
>
> I would be happy about a hint.
>
> Thanks a lot
> Michael