On Mon, Jun 7, 2010 at 4:34 AM, Dimitri Fontaine <dfontaine@xxxxxxxxxxxx> wrote:
Eliot Gable <egable+pgsql-general@xxxxxxxxx> writes:I'd try having the function return just numbers in the right order, then
> I have a set of results that I am selecting from a set of tables which I want to return in a random weighted order for each priority group returned. Each row has a
> priority column and a weight column. I sort by the priority column with 1 being highest priority. Then, for each distinct priority, I want to do a weighted random
> ordering of all rows that have that same priority. I select the set of rows and pass it to a custom-built function that does the ordering. I have tested both the
> prioritize and the random weighted ordering functions and they do exactly what I want them to do for ordering the data that I send them.
>
> The problem comes from the fact that I tried to make them generalized. They take an array of a small complex type which holds just an arbitrary ID, the priority,
> and the weight. The output is the same information but the rows are in
> the correct order.
use that in the ORDER BY. To have those numbers, you'd still need to
join with the result of the function, tho.
Hope this helps you already, I don't have time to go deeper in the
subject!
Regards,
--
dim
--
Eliot Gable
"We do not inherit the Earth from our ancestors: we borrow it from our children." ~David Brower
"I decided the words were too conservative for me. We're not borrowing from our children, we're stealing from them--and it's not even considered to be a crime." ~David Brower
"Esse oportet ut vivas, non vivere ut edas." (Thou shouldst eat to live; not live to eat.) ~Marcus Tullius Cicero
