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For example, use a trigger to prohibit updates to the employee table during weekends and nonworking hours.
Use triggers only to enforce complex security authorizations that you cannot define using the database security features provided with the database.
The trigger in Example 9-16 does a complex check before allowing the triggering statement to run.
The exception ORA-04091 (mutating-table error) allows the trigger emp_dept_check to be used with the UPDATE_SET_DEFAULT and emp_dept_check is used alone.
Deptno; END IF; END; / DELETE CASCADE Trigger for Parent Table The trigger in Example 9-14 enforces the DELETE dept table.