Help with validating required fields

Question

I have approximately 50 columns in a result set. I need to find out if the required fields (20 out of those 50 columns are required fields) have values (not empty field).
Since I'm dealing with a large result set (approximately 3000 to 5000 records), what is the most efficient thing to do to validate each field?
For example:
Column A, B,C,D.E.F, etc are required fields, I need to validate that each of these column has value otherwise I need to <CFABORT> the process and notify the user.

Answer 1

The data is not yet in our database,they are created in memory when the app. is run.
I have sort of  Xml To Query function that generates a result set. I'm doing some validation on req. fields before they are inserted into our DB.
I try to run your code but I got an error:The value '' cannot be converted to a number
Here is my code imitating yours (For testing I'm using fewer columns):
<CFSET MandatoryFields = "Org,OrgId,LastName,FirstName,Gender,Address,City,State,Zip,Phone"> 
<cfquery name="q1" dbtype="query"> 
<cfloop list="#MandatoryFields#" index="ThisField"> 
select Org, '#ThisField# null' problem 
from ResutSet 
where #ThisField# is null 
union 
</cfloop>
select Campus, '' problem 
from ResutSet 
where 1 = 2 
</cfquery>
<cfabort>