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From: Gary Stainburn <gary.stainburn@ringways.co.uk>
Organization: Ringways Garages Ltd
To: "'pgsql-sql@postgresql.org'" <pgsql-sql@postgresql.org>
Subject: Re: best way to swap two records (computer details)
Date: Wed, 23 Mar 2005 17:26:06 +0000
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On Friday 18 March 2005 7:54 pm, you wrote:
> > My question is what's the best way to swap settings between the two
> > computer records and swap any software installed?  Ideally I'd like
> > it in the form of a function where I can pass the two p_id's and
> > return a boolean reflecting success (true) or fail (false).
>
> 	I'd say something like that (generic table names) :
>
> If you're confident :
> UPDATE stuff SET owner = (CASE IF owner='A' THEN 'B' ELSE 'A' END)
> WHERE owner IN ('A','B')
>
> If you're paranoid :
> UPDATE stuff SET owner = (CASE IF owner='A' THEN 'B' ELSE IF
> owner='B' THEN 'A' ELSE owner END) WHERE owner IN ('A','B')

Hello again.

I've tried the first one but get a syntax error. Anyone see why?

hardware=# update pieces set p_owner = (case if p_owner = 305 then 724 
else 305 end) where p_owner in (305, 724);
ERROR:  parser: parse error at or near "p_owner"
hardware=#


-- 
Gary Stainburn
 
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