Query: dynamodb_table_item_count_by_creation_month

with volumes as (
  select
    title,
    item_count,
    creation_date_time,
    to_char(creation_date_time,
      'YYYY-MM') as creation_month
  from
    aws_dynamodb_table
),
months as (
  select
    to_char(d,
      'YYYY-MM') as month
  from
    generate_series(date_trunc('month',
        (
          select
            min(creation_date_time)
          from
            volumes
        )),
        date_trunc('month',
          current_date),
        interval '1 month') as d
),
tables_by_month as (
  select
    creation_month,
    sum(item_count) as item_count
  from
    volumes
  group by
    creation_month
)
select
  months.month,
  tables_by_month.item_count as "Count"
from
  months
  left join tables_by_month on months.month = tables_by_month.creation_month
order by
  months.month;