Creating ALV Webdynpro Application

Hi Experts,

I have a new requirement to create a Webdynpro application , I have read so many document in SDN for this, from which I got to know that they are creating nodes at that time they are giving structure name as table name....and they are fatching data from single table but I have to fetch data from different table how do I create that with selection input parameter could any one give me some documents..in which they are fetching data from different table and showing the ALV outpt..

Please Help me out of his..

Thanks

Abhay Manna.