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Developer-C 11.1
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CREATE TABLE mytable ( id NUMBER PRIMARY KEY, date_created DATE );
ALTER TABLE mytable MODIFY date_created DEFAULT SYSTIMESTAMP AT TIME ZONE 'UTC';
INSERT INTO mytable( id ) VALUES ( 1 );
1 rows affected
ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';
SELECT * FROM mytable;
ID
DATE_CREATED
1
2022-06-15 03:45:29