Many thanks both, those solutions are great and have gone in my wiki for future 
ref.
Regards
Oliver

On 21 Sep 2011, at 21:56, Szymon Guz wrote:

> 
> 
> >> Short answer is: yes. More information you can find
> >> here 
> >> http://simononsoftware.com/problem-with-random-in-postgresql-subselect/
> >> regards
> >> Szymon
> >>
> >

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