SQL duplicate a set of records within same file

["Jeff Crosby" <jlcrosby@xxxxxxxxxxxxxxxx>]

I don't know if this is possible, but I gotta ask.

I'm changing a formerly multimember DDS defined file into a single member
DDL defined table by adding fields that keep batches separate.  On occasion,
we have the need to duplicate a batch.  We were able to do this before via
CPYF because we copied to a different member, so there was no need to change
any field values.

What I essentially want to do is duplicate all records with KEY1, KEY2,
fld1, fld2, fld3, ... fldn to NEWKEY1, NEWKEY2, fld1, fld2, fld3, ... fldn
within the same file.  Since I'm handling a _set_ of records, it seemed
logical to try SQL for this.  I know it takes an INSERT, but the examples
I'm finding online seem to be specific to a particular database, or so it
seems.  It would also be nice to not have to name all the columns . . .