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Re: string is sometimes null ?

From: Richard Huxton <dev(at)archonet(dot)com>
To: Graeme Hinchliffe <graeme(dot)hinchliffe(at)zeninternet(dot)co(dot)uk>
Cc: Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>,pgsql-general(at)postgresql(dot)org
Subject: Re: string is sometimes null ?
Date: 2004-09-30 09:26:53
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Graeme Hinchliffe wrote:
>>If monthcurr or username are null, the above will be null.
>>Anything || NULL => NULL.
> AH! thanks sorted it now.  That is not the behaviour I would have
> expected :)
> Is there a concatination operator that will not do this? IE 
> if 
> var1 || var2 || var3
> and var2 is null would result in just var1var3  ?

You could use coalesce(var1,'') || coalesce(var2,'')
Or, wrap that in your own function and create your own operator.

   Richard Huxton
   Archonet Ltd

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