tsql, multiplying two columns to create a new column

I struggled through making this query.  Now I'm trying to create a new field by multiplying two fields but am not able to make it work.
This works:
SELECT Guest.RegistrationID2, Registration.RegistrationID2, StudentID, FirstName, LastName, PreferredName, StudentEmail, MailAddress1, MailAddress2, MailCity, MailState, MailZip, CommunicationPreference, IsActive, ApplicationIDPrimary, Sum(CPSTransaction.AuthorizationAmount) as Total_Paid, COUNT(Guest.GuestRegID) as Guests
FROM Registration Left Join CPSTransaction ON StudentID= ApplicationIDPrimary LEFT JOIN Guest ON Registration.RegistrationID2 = Guest.RegistrationID2
WHERE IsActive = 'True' AND (CommunicationPreference = 'Email') 
Group by Guest.GuestRegID, Guest.RegistrationID2, Registration.RegistrationID2, Registration.StudentID, CPSTransaction.AuthorizationAmount, FirstName, LastName, PreferredName, StudentEmail, MailAddress1, MailAddress2, MailCity, MailState, MailZip, CommunicationPreference, IsActive, ApplicationIDPrimary
Order by SUM(AuthorizationAmount), COUNT(Guest.GuestRegID)

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When I add this line to the select statement, I break it.
SUM(CPSTransaction.AuthorizationAmount - ((55 * COUNT(Guest.GuestRegID) + 100))) as Total_Due

Error:
Cannot perform an aggregate function on an expression containing an aggregate or a subquery.


I would appreciate any help with this.
Thanks.
javierpdxAsked:
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mbizupConnect With a Mentor Commented:
Try this:

Sum(CPSTransaction.AuthorizationAmount) - (COUNT(Guest.GuestRegID) * 55 + 100)

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Your parentheses were originally in the wrong place.
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mbizupCommented:
What exactly are you trying to do?

Your question title mentions multiplying two columns, but the expression that you are having trouble with is not multiplying them.

>>> SUM(CPSTransaction.AuthorizationAmount - ((COUNT(Guest.GuestRegID) * 50) + 100)

Should the minus sign be a multiplication sign?


SUM(CPSTransaction.AuthorizationAmount)  * COUNT(Guest.GuestRegID) * 50 + 100
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
You will have to transform the formula to use no aggregates in aggregates. Sum(count()) is the issue.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The formula does not make sense to me. Arithemetic transformation leads to
  sum(CPSTransaction.AuthorizationAmount)
 + count(*)*100
 + count(Guest.GuestRegID)*count(*)*55
which doesn't look reasonable.
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javierpdxAuthor Commented:
Sorry for the confusion.

I'm trying to multiple COUNT(Guest.GuestRegID) by 55, then add 100 to it.
Then subtract this value from Sum(CPSTransaction.AuthorizationAmount) to get the total still due.

Thanks.
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javierpdxAuthor Commented:
Thanks so much!  Worked great.

I will post a follow up question in a new thread.
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