Simple Math in SQL Query or cfset

Question

Calculated fields in the DB vs <cfset>?
It would seem simple, but:
ACCESS DB ;>(
CF9
IIS
<cfquery name="get_total" datasource="#Request.BaseDSN#">
SELECT SUM((current_charge+penalty)-credit) AS total
FROM moorings
WHERE mooring_ID = #URL.mooring_ID#
</cfquery>
<cfdump var="#total#"> 
Variable TOTAL is undefined?
or
<cfset subtotal = current_charge+penalty>
<cfset total = subtotal-credit>
Variable CURRENT_CHARGE is undefined?
Missing ',", (, #'s?
Thanks

Answer 1

Run the query without using SUM to see what values are stored in the database:
<cfquery name="get_total" datasource="#Request.BaseDSN#">
SELECT current_charge, penalty, credit
FROM moorings
WHERE mooring_ID = #URL.mooring_ID#
</cfquery>
<cfoutput>
charge: #get_total.current_charge#<br />
penalty: #get_total.penalty#<br />
credit: #get_total.credit#<br />
</cfoutput>
or
<cfdump var="#get_total#">
Also, it's a good idea to get into the habit of using cfqueryparam in your SQL queries. It helps sanitize your inputs and prevents SQL injection attacks:
<cfquery name="get_total" datasource="#Request.BaseDSN#">
SELECT current_charge, penalty, credit
FROM moorings
WHERE mooring_ID = <cfqueryparam value="#URL.mooring_ID#" cfsqltype="cf_sql_integer">
</cfquery>