spool

set line 1000;

set head off
set echo off
set feed off
set heads off
set pages 50000
SET NEWPAGE NONE
spool bb.txt
SELECT A.FMONITORCODE
FROM tb_test A
WHERE A.YMPH='2021040044C' and A.FSTATIONCODE='123456'
and FSHOTDATED='2021-05-16';
spool off;

可以适当调整set line 1000;