Re: Select x random rows from DB

On Feb 20, 2011, at 4:30 PM, Christophe Pettus wrote:

>
> On Feb 20, 2011, at 2:19 PM, galago wrote:
>
>> What is the best way, to select X random rows from DB? I know that method: .all().order_by('?')[:X] is not good idea.
>
> The best way is to push it onto the DB, using a raw query:
>
> random_results = Table.objects.raw("SELECT * FROM table ORDER BY random() LIMIT X")

If you have lots of rows, this query is really slow as the db must build a new table for the ORDER BY.

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