Question

i would like to know whether the following query is optimized?

 select 
  SUM(payments.paid_amt) as paid_amt, 
  SUM(payments.copay_amt) as copay_amt,
  SUM(payments.CO_INSURANCE_AMT) as co_ins_amt,
  payor_group.PAYOR_GROUP as payor_group,
  DATEPART(MM,accession.XIFIN_LOAD_DATE) as load_month,
  DATEPART(yyyy,accession.XIFIN_LOAD_DATE) as load_year

  from 
  [F_PAYOR_PAYMENTS_monthly] payments

  join D_PAYOR payor
  on payor.PAYOR_ID=payments.PAYMENT_PAYOR_ID

  join D_PAYOR_GROUP payor_group
  on payor.PAYOR_GROUP_KEY=payor_group.PAYOR_GROUP_KEY

  join F_ACCESSION_DAILY accession
  on accession.ACCESSION_ID=payments.ACCESSION_ID

  group by  payor_group.PAYOR_GROUP, DATEPART(MM,accession.XIFIN_LOAD_DATE),
  DATEPART(yyyy,accession.XIFIN_LOAD_DATE)

it has been executing for about 1.5 hours now. there are no indexes on any tables yet!

every table has around 10,000,000 rows.

is there any way i can simplify this query to improve execution time?

thank you so much for your guidance and time.

Answer 1

Why use a With at all?

  select 
  SUM(payments.paid_amt) as paid_amt, 
  SUM(payments.copay_amt) as copay_amt,
  SUM(payments.CO_INSURANCE_AMT) as co_ins_amt,
  payor_group.PAYOR_GROUP as payor_group,
  DATEPART(MM,accession.XIFIN_LOAD_DATE) as load_month,
  DATEPART(yyyy,accession.XIFIN_LOAD_DATE) as load_year

  from 
  [F_PAYOR_PAYMENTS_monthly] payments

  join D_PAYOR payor
  on payor.PAYOR_ID=payments.PAYMENT_PAYOR_ID

  join D_PAYOR_GROUP payor_group
  on payor.PAYOR_GROUP_KEY=payor_group.PAYOR_GROUP_KEY

  join F_ACCESSION_MONTHLY accession
  on accession.ACCESSION_ID=payments.ACCESSION_ID

  group by  payor_group.PAYOR_GROUP, DATEPART(MM,accession.XIFIN_LOAD_DATE),
  DATEPART(yyyy,accession.XIFIN_LOAD_DATE)