SQL: insert records, but intialize most fields to blanks & zeros

I need to capture the RRN of a record, and later come by and populate remaining fields with current values.

insert into orderDTL (
select rrn(a) as rrn
from orderDTL a join orderHDR b on a.ORDER# = b.ORDER#


This fails because there are more fields in orderDTL file than just RRN.

How can I initialize the other fields to spaces & zeros?

Should I do a 2-step process and CREATE a new file followed by CPYF *MAP *DROP?



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