On 19 Mar, 22:49, maxi <maxiroba...@gmail.com> wrote:
> Hi,
>
> Which is the better way to do this on orm language ?
>
> select filed1, sum(field2 * field3)
> from a_table
> group by field1
>
I believe this is not possible in the current Django ORM.
It would need something like this to work:
MyModel.objects.annotate(mult_result=F('field2') *
F('field3')).values('field1').annotate(sum_result=Sum('mult_result'))
- which I find much more ugly than the raw SQL.
Also, you doesn't seem to need to get database rows (objects), just
some custom statistics, and ORM stands for Object-Relational Mapper,
which also makes the SQL way perfectly justified.
--
Tomasz Zielinski
pyconsultant.eu
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