Analyze service costs month over month

Postgres SQL, as run

select date_trunc('month', charge_period_start at time zone 'UTC') as charge_month,
       provider_name as provider_name,
       service_name as service_name,
       sum(effective_cost) as total_effective_cost
from focus.cost_and_usage
where charge_period_start >= $1::timestamptz
  and charge_period_start < $2::timestamptz
group by date_trunc('month', charge_period_start at time zone 'UTC'), provider_name, service_name
order by charge_month asc, total_effective_cost desc nulls last, provider_name asc nulls last, service_name asc nulls last
limit 500

Parameters: $1 = period_start, $2 = period_end

Original FOCUS SQL

SELECT
  MONTH(ChargePeriodStart),
  ProviderName,
  ServiceName,
  SUM(EffectiveCost) AS TotalEffectiveCost
FROM focus_data_table
WHERE ChargePeriodStart >= ? AND ChargePeriodStart < ?
GROUP BY 
  MONTH(ChargePeriodStart), 
  ProviderName,
  ServiceName
ORDER BY
  MONTH(ChargePeriodStart),
  SUM(EffectiveCost) DESC