MySql søgerangering med kriterier

Den forespørgsel, der tæller for hver kundes samlede opkald og besvarede opkald for den angivne kampagne

select 
    c.id,
    count(*) as total_calls,
    sum(case when answered=1 then 1 else 0 end) as answered_calls
from customer c
     join calls cs on c.id=cs.customer_id
where cs.campaign='2016-09'
group by c.id

Så kan du bruge forespørgslen ovenfor som en underforespørgsel til at bestille

select sub.id, (@rank:[email protected]+1) as rank
from (the subquery above) sub, (select @rank:=1)
order by 
  case when sub.total_calls=0 then 0 else 1,
  sub.total_calls, 
  sub.answered_calls*100/sub.total_calls

Du kan inkludere alle ønskede kolonner i resultatforespørgslen