Question

I have a payment table in a SQL Server 2008 database, this holds both payment amounts and credit amounts, credits are identified by the field txt_pay_type which would be equal to ‘credit’.

I am trying to output some reports, one being total revenue per website.

I am using this select statement to get the sum and average values per website, how can i get it to take away the credit amounts.

So the final webTotal is less and credits.

I.e do a sum of all the payments which are not credits (like below), do a sum for all the payments which are credits and take one from the other. Or i am better to do this on the page with cold fusion?

E.g Website 1 Total of 5000 in payments, 1000 in credits. Results would be;

Website    Total Revenue  Average Sale   
Website 1  4000           200.00


SELECT 
  txt_web_name,
  SUM(mon_pay_amount) AS webTotal,
  AVG(mon_pay_amount) AS webAvg
FROM
  tbl_payment
  INNER JOIN dbo.tbl_orders ON (uid_pay_orderid = uid_orders)
  INNER JOIN dbo.tbl_websites ON (uid_order_webid = uid_websites)
WHERE
  dbo.tbl_payment.bit_pay_paid = <cfqueryparam cfsqltype="cf_sql_bit" value="yes">
  AND txt_pay_status <> <cfqueryparam cfsqltype="cf_sql_varchar" value="Credit">
GROUP BY
  txt_web_name

Any pointers would be appreciated.

Answer 1

You need a conditional sum:

SELECT txt_web_name, SUM(mon_pay_amount) AS webTotal, AVG(mon_pay_amount) AS webAvg,
       sum(case when txt_pay_type <> 'Credit' then mon_pay_amount else 0 end
          ) as TotalNoCredit,
       avg(case when txt_pay_type <> 'Credit' then mon_pay_amount end
          ) as AvgNoCredit
FROM tbl_payment
     INNER JOIN dbo.tbl_orders ON (uid_pay_orderid = uid_orders)
     INNER JOIN dbo.tbl_websites ON (uid_order_webid = uid_websites)
WHERE dbo.tbl_payment.bit_pay_paid = <cfqueryparam cfsqltype="cf_sql_bit" value="yes">
      AND txt_pay_status <> <cfqueryparam cfsqltype="cf_sql_varchar" value="Credit">
GROUP BY txt_web_name

Notice for the sum, I default to 0, so no values in a month will result in $0. For the average, I default to NULL, so the credit values do not get calculated in the average.