SQL How to show '0' value for a month, if no data exists in the table for that month

Answer 1

You can also add in the year if you have a creation date for the interactions you are counting which may be helpful if your interactions span the course of many years.

with Months(Month) as
(
  select 1
  union all
  select Month + 1
  from Months
  where Month < 12
)
select M.Month, year(CreatedOn) as Year,
       count(amount) Count,
       isnull(sum(amount), 0) Sum
from Months as M
  left outer join Charge as C
    on M.Month = (month(CreatedOn))
group by M.Month, year(CreatedOn) order by year(CreatedOn)