...'1234512345' ||
rpad(substr(a.check_number, 2, 10) || ' ', 10) ||
rpad(to_char(a.check_date, 'yyyymmdd') || ' ', 8)||
rpad(lpad(trunc(a.check_amt * 100, 0), 11, '0') || ' ', 11)||
rpad(' ',15) ||
decode(a.check_recon_status, 'V', 'V',' ')||
rpad(' ',80) as col1
from table a, table b
where...