You're welcome.

>Sergey,
>
>Thanks a lot for your further advice.
>
>KM
>
>
>>I think you should change ORDER BY clause to

ORDER BY lastname, firstname, CustID

otherwise you could miss some records under following conditions
>>- First and last name are the same
>>- There are more than 2 such records
>>- CustID values arent in sequential order in those records.
>>