Oracle : Ошибка ORA-30401


"JOIN KEY columns must be non-null"
*Cause: The dimension statement failed because the column(s) in the JOIN
KEY clause permitted NULL values. The JOIN KEY columns are related
to the columns of the dimension's skip levels in one or both of the
following ways:
1. A skip level is defined over one or more of the JOIN KEY
columns.
2. The attribute clauses of a skip level determine one or more of
the JOIN KEY columns.

*Action: Modify the JOIN KEY columns so that they do not allow NULL
values.

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