Query: ibm_is_security_group_by_creation_month

with security_group as (
  select
    title,
    created_at,
    to_char(created_at,
      'YYYY-MM') as creation_month
  from
    ibm_is_security_group
),
months as (
  select
    to_char(d,
      'YYYY-MM') as month
  from
    generate_series(date_trunc('month',
        (
          select
            min(created_at)
            from security_group)),
        date_trunc('month',
          current_date),
        interval '1 month') as d
),
security_group_by_month as (
  select
    creation_month,
    count(*)
  from
    security_group
  group by
    creation_month
)
select
  months.month,
  security_group_by_month.count
from
  months
  left join security_group_by_month on months.month = security_group_by_month.creation_month
order by
  months.month;