marca de tiempo de Oracle Current
-- In SESSION time zone
SELECT current_timestamp FROM dual; -- 2021-05-07 05:36:57.476000
SELECT current_timestamp(2) FROM dual; -- 2021-05-07 05:36:57.470000
SELECT current_date FROM dual; -- 2021-05-07 05:36:57
-- In SYSTEM on which database resides
SELECT systimestamp FROM dual; -- 2021-05-07 07:36:57.762000 +02:00
SELECT sysdate FROM dual; -- 2021-05-07 07:36:57
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