select * from V$NLS_PARAMETERS; SQL> alter session set NLS_DATE_LANGUAGE = ‘SIMPLIFIED CHINESE’; Session altered SQL> Select to_char(sysdate,’yyyy-Mon-day’) from dual; TO_CHAR(SYSDATE,’YYYY-MON-DAY’ —————————— 2009-5月 -星期三 SQL> alter session set NLS_DATE_LANGUAGE=’AMERICAN’; Session altered SQL> Sel