DIA-28069：A data redaction policy already exists on this object.
错误码
错误描述：A data redaction policy already exists on this object.
错误原因：A data redaction policy was already in existence on this object.
解决方法：Specify a table or view which does not already have a redaction policy defined on it, or use DBMS_REDACT.ALTER_POLICY to alter the existing redaction policy for this object.
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