Finding duplicates within a date range. SQL help please!!

Question

I have a table of records and I am trying to query the duplicate emails that appear within a given date range but cant figure it out.
There records that it returns are not all duplicates withing the given date range.  HELP!!
Here is my query.
Thanks in advance.
SELECT cybTrans.email, cybTrans.trans_id, cybTrans.product_number, cybTrans.*
FROM cybTrans
WHERE (((cybTrans.email) In (SELECT [email] FROM [cybTrans] As Tmp GROUP BY [email] HAVING Count(*)>1 ))
AND ((cybTrans.product_number)='27')
AND ((cybTrans.appsystemtime)>'03-01-2010')
AND ((cybTrans.appsystemtime)<'03-05-2010')
ORDER BY cybTrans.email;

Answer 1

Yet another method...
<cfset start_date = DateFormat('01/01/2007',
'mm/dd/yyyy')>
<cfset end_date = DateFormat('09/30/2009',
'mm/dd/yyyy')>
<cfset start_year = DatePart('yyyy', start_date)>
<cfset end_year = DatePart('yyyy', end_date)>
<cfset schoolyear_start = '09/01/'>
<cfset schoolyear_end = '06/30/'>
<cfset count = 0>
<cfloop index="rec" from="#start_year#"
to="#end_year#">
<cfset tmp_start = DateFormat('#schoolyear_start##rec#',
'mm/dd/yyyy')>
<cfset tmp_end = DateFormat('#schoolyear_end##rec + 1#',
'mm/dd/yyyy')>
<cfif DateCompare(tmp_start,start_date) gt -1 and
DateCompare(tmp_end, end_date) eq -1>
<cfset count = count + 1>
</cfif>
</cfloop>
<cfoutput>
<br>There are #count# school year periods between
#start_date# and #end_date#
</cfoutput>