Query: sql_database_by_creation_month

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