Division af heltal giver 0

Du bør kaste før du deler, men du manglede også en underforespørgsel for at få det samlede antal fra tabellen. Her er prøven.

select 
  random_int,
  count(random_int) as Count,
  cast(count(random_int) as decimal(7,2)) / cast((select count(random_int) from test) as decimal(7,2)) as Percent
from test
group by random_int
order by random_int;