sql - group by in ranges to include ranges without values

Question

Suppose a scenario similar to this question. I want to get the following results:

score range  | number of occurrences
-------------------------------------
   0         


        

Answer 1

select r.range as [score range], count(*) as [number of occurences]
from 
    (
    select ' 0- 9' as range, 9 as endrange
    union all select '10-19',19
    union all select '20-29',29
    union all select '30-39',39
    union all select '40-49',49
    union all select '50-59',59
    union all select '60-69',69
    union all select '70-79',79
    union all select '80-89',89
    union all select '90-99',99
    ) as r
left join scores s on 
    r.endrange = case 
    when s.score > 90 then 99
    when s.score > 80 then 89
    when s.score > 70 then 79
    when s.score > 60 then 69
    when s.score > 50 then 59
    when s.score > 40 then 49
    when s.score > 30 then 39
    when s.score > 20 then 29
    when s.score > 10 then 19
    when s.score > 0 then 9
    end
group by r.range