按django分组，不同

Question

What would be the equivalent statement for querying model in Django

select distinct final_category, count(responders) 
from johnson_jnjusage 
where no_of_people_house = "4" and 
      child_age_group="0 to 12 months" and 
      city = "HYDERABAD" and 
      nursing_cnt = "2ND TIME MOTHER" and 
      bucket="BRAND PENETRATION" 
group by final_category;

Thanks

Answer 1

Based on the Django docs for aggregation , it might look something like this:

from django.db.models import Count
Usage.objects.filter(no_of_people_house='4', city='HYDERABAD', nursing_cnt='2ND TIME MOTHER', bucket='BRAND PENETRATION').values('final_category').annotate(responders=Count('responders'))

The order of the filter, values and annotate clauses is important as it defines how the aggregation behaves.