Thanks a lot lutz;)
I think your solution is great and I think it must change my way to thinking about queries.;-)
Sorry about wasting your time to learn how to upload a question... I know how grateful you are...
So I take 3 advantage here from you:
1- My problem solved
2- I have learned how to upload a query to a friend for help
3- I'm trying to change the way of thinking to queries