Oracle : Ошибка 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.

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