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Re: Random multiple times

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On 21 September 2011 10:51, Oliver Kohll - Mailing Lists <oliver.lists@xxxxxxxxxx> wrote:
Hi,

I understand random() is a volatile function and runs multiple times for multiple rows returned by a SELECT, however is there a way of getting it to run multiple times *within* another function call and in the same row. i.e. something like

select regexp_replace('+1 555 555 555', E'\\d', trunc(random() * 9 + 1)::text,'g');
 regexp_replace
----------------
 +1 111 111 111
(1 row)

As you can see, it returns the same digit each time. I've tried wrapping a select around the trunc too.

Regards
Oliver Kohll
www.gtwm.co.uk / www.agilebase.co.uk




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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