ORA-30502: system triggers cannot have INSERT, UPDATE, or DELETE as triggering events
Cause: An attempt was made to create a system trigger with INSERT, UPDATE, or DELETE triggering events, but this type of trigger is not supported because a system trigger does not have a base table.
Action: Do not attempt to create a system trigger with INSERT, UPDATE, or DELETE triggering events.
ORA-30503
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ORA-30502system triggers cannot have INSERT, UPDATE, or DELETE as triggering events