title: Group by, distinct, count in django
body: <p>What would be the equivalent statement for querying model in Django</p>
  
  <pre><code>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;
  </code></pre>
  
  <p>Thanks </p>