Select Code to Download

create table curtisb_map
( row3_code   varchar(20)          -- pure guess
, row4_code   varchar(20)          -- purer guess
, primary key (row3_code, row4_code)
);

select s.*, m.row_3_code
from staging.staging_prepouics s
    inner join curtisb_map m on m.row3_code = s.whatever