Another raw same as primary key

Write the data, read it back, copy the value, write the update.

Curious as to why you want to do this? A 3rd Normal Form database tries to remove duplicate data and what you're asking for moves away from that. What is it that this will give you that having the value only  as the primary key does not?

Hello thiliniu0001,

Once your records are written, use the output from the records and run a script using update function and write the identifier values in the required columns. That would be the best way to do as per your requirement.