InfoPath Dev

Hi,
I have a problem with my master-detail element. I read all my adresses from a SQL-Server in my Master-View.
I add some textboxes to detail-View for closer information about a person.
My aim is to get this information by clicking on UserName at the Master-View. But now, i dont know how could I do that. I have no experiences in JScript or VBS. Could I solve it without any self written code?

Best regards... :)

Mike

I solved my problem. Its only possible with a primary datasource.
But when I click on a user. I always get more than one result. Why?

Best regards

Mike