oracle数据库实现获取时间戳的无参函数

CREATE OR REPLACE FUNCTION GETMSTIMESTAMP RETURN NUMBER AS MSTIMESTAMP NUMBER; BEGIN SELECT (SYSDATE-TO_DATE('1970-1-18', 'YYYY-MM-DD HH24')) * 86400000 + TO_NUMBER(TO_CHAR(SYSTIMESTAMP(3), 'FF')) INTO MSTIMESTAMP FROM DUAL; RETURN MSTIMESTAMP; END;

SELECT (SYSDATE - TO_DATE('1970-1-1 8', 'YYYY-MM-DD HH24')) * 86400 FROM DUAL;(SYSDATE-TO_DATE('1970-1-1 8','YYYY-MM-DDHH24'))*86400-----------------------------------------------------1167040878

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