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Oracle generates millisecond timestamps
2022-04-23 13:40:00 【Wangcai 2】
SELECT (SYSDATE - TO_DATE('1970-1-1 8', 'YYYY-MM-DD HH24')) * 86400000 + TO_NUMBER(TO_CHAR(SYSTIMESTAMP(3), 'FF')) AS MILLIONS FROM DUAL;
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