On Mon, Jun 12, 2006 at 06:58:06PM -0400, Tom Lane wrote:
> "Milen Kulev" <makulev@gmx.net> writes:
> > What is wrong with random() ?
>
> Not guaranteed to be stable across the multiple evaluations that the
> rule will perform ... remember a rule is a macro and has the usual
> multiple-evaluation gotchas in the face of volatile arguments.
I believe a safe alternative would be...
INSERT INTO ... SELECT * FROM
(SELECT random()*20 FROM ...)
;
You might need to add an ORDER BY to the subquery to ensure PostgreSQL
doesn't pull it into the main query.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
