Oracle : Ошибка ORA-21601


"attribute is not an object"
*Cause: The user attempts to perform an operation (that is valid only for
an object) to an attribute of a built-in type.
An example of such an illegal operation is to dynamically set
a null structure to an attribute of a built-in type.
*Action: User should avoid performing such operation to an attribute of
built-in type.

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