Assigning a Variable a Null Value

Question

Hi all. I've got a loop that queries a query outside of the
loop. The problem is, the query may get defined, and it may not.
But if it gets defined, how do I undefine it for the next loop
iteration. Here's some code to wrap your head around it (edited for
brevity).
<cfloop>
<cfset queryValue = possibleEmptyString >
<cfif Len(queryValue)>
<cfquery name="queryName" dbtype="query">
select * from something
</cfquery>
</cfif>
<cfif IsDefined("queryName") AND
queryName.RecordCount>
error="some error message"
</cfif>
</cfloop>
So, is there not a Function that sets the var to Undefined,
or Null, or something? If not, what's the alternative?
Thanks all! ;)

Answer 1

<cfloop>
<cfset queryValue = possibleEmptyString >
<cfset queryName = QueryNew()> <!--- this ensures
that queryName is always defined, and is always a query --->
<cfif Len(queryValue)>
<cfquery name="queryName" dbtype="query">
select * from something
</cfquery>
</cfif>
<cfif queryName.RecordCount>
error="some error message"
</cfif>
</cfloop>