Copy rows from the same table and update the ID column

Question

I have the following table

I have inserted Product B to it and it gives me an ID of 15

Answer 1

Do you use Oracle? It does not have an automatic PK_generator, nothing to work for your INSERT silently. However, it has SEQUENCEs, so let's use its NEXTVAL:

INSERT INTO Orders_tab (Orderno, Custno)
    VALUES (Order_seq.NEXTVAL, 1032);

The INSERT operation is exactly the case for them, the purpose of a SEQUENCE, you just have to use it explicitly. More described: Managing Sequences # Using Sequences

The node for Sequences is on the level of Tables, i.e. in the SQLdeveloper. Ours are ID_GENERATOR, in every DB.