Reg : Logic in ABAP

Hi Experts ,

I need some logic from u r side ..

For example !!!

1 . iam having table sbook which contains some duplicate entries.

my ques is iam planning to write some logic in my ypsu_cos Program.

i.e 1. First it has to delete all duplicate entries from sbook table .

2. from now onwards it has to check each & evry time , if any duplicate entry exits or not ? if so it has to delete the entry & if not it has to insert the value

Regs ,

Narayana Murthy