Simple average query

[kbrooks]

I apologize, I know this has been covered. But I just spent half an hour reading old posts and still can't quite decide how to apply it to what I'm doing.

I have a db that logs surgeries and all their details. One of the new things they want to do is be able to run a list of average cost for a certain surgery, since patients are always asking ahead of time how much it will cost. I have a query (and report that runs from it) that will list all the surgeries and total charges for individual ones for a date range the user specifies. But I can't figure out how to make it calculate an average charge for each surgery. I could if there were always a certain number to divide by, but of course there could be 2 of this type of surgery and 57 of that type.

The query I currently have set up is:

Field: MR#
Table: SurgeryLog

Field: Wname: [LastName] & ", " & [FirstName] & " " & [Initial]
Table:
Sort: Ascending

Field: OperationDate
Table: Surgery Log
Criteria: >=[Enter Start Date]

Field: PatientType
Table: SurgeryLog
Criteria: "SDS"

Field: TotalCharges
Table: SurgeryLog
Criteria: >0

Field: Operations: [Operation1Performed] & Chr(13) & Chr(10) & [Operation2Performed] & Chr(13) & Chr(10) & [Operation3Performed]


Thanks much!

 

[KenHigg]

In a totals query, couldn't you simply bring down the criteria flds as 'where', then group on surgery type and avg the costs?