On Wed, 12 Nov 2008 11:17:03 -0500
Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
> Ivan Sergio Borgonovo <mail@xxxxxxxxxxxxxxx> writes:
> > insert into mytop (id,n) select id, nextval('tmp_seq')
> > from biglist join mylist on biglist.id=mylist
> > order by biglist.something limit 3;
>
> I suspect you are expecting the nextval()s to be done after the
> LIMIT, but actually they'll most likely be done before it, ie
> you're getting a lot of unintended nextvals happening. Try doing
> the ORDER BY/LIMIT in a sub-select.
Thanks. That did it.
I think I've seen similar replies before... but I couldn't relate
them to my problem.
I'd do like Bart Simpson: order by, limit, nextval, sequence, order
by, limit, nextval, sequence...
so that this answer will be well indexed ;)
--
Ivan Sergio Borgonovo
http://www.webthatworks.it
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