oracle数据库获取当前时间戳-毫秒级别

oracle数据库获取当前时间戳

SELECT (SYSDATE - TO_DATE('1970-1-1 8', 'YYYY-MM-DD HH24')) * 86400000 + 
TO_NUMBER(TO_CHAR(SYSTIMESTAMP(3), 'FF')) AS MILLIONS FROM DUAL;