Generic Extraction from Database View.

Dear Friends,

I have to extract data from two tables using Generic extraction.

Please can you help me the following issues.

1: There two tables Tab1 and Tab2. How can I link them in view and based on what Keys.. there many same fields existing in both.

2: In Tab2 there are some fields which does not exist in Tab1 , how can I do that in view.

3: I have almost 4000 records from the tables may be We have to pull every week in to BW. As records are very less is it possible to do Full Update every time or still we required Delta in Generic...

4: Please can you also let me know the steps to do Full Update if so.

Thanks,

Sudha...