Live table insertion help required

Question

I face issue of constraint violation the time when i try to insert record which already exist in table actually the table is getting populated on real basis and the record which i try to upload is around 2.5 million.
I need a PL/SQL code which perform insertion into live table and don't insert those records which already exists in live table.
I am new in PL/SQL and need your expert guidence
Please help
regards,

Answer 1

In pl/sql you can trap oracle errors via an exception handler. For instance suppose you want to insert two rows, and the second row already exists (i.e. that row will get an oracle key-constraint error).
The way to deal with such an error in this case, would be to write a handler for the DUP_VAL_ON_INDEX error.
begin
  begin
    insert into some_table values(.. some values ..);
    insert into some_table values(.. some other values ..);
  exception when dup_val_on_index
    then null;
  end;
  commit;
end;Above code will ignore the error for the second row, and will keep the first row inserted (and committed).