Oracle : Ошибка ORA-30452

30452, 00000, "cannot compute AVG(X), VARIANCE(X) or STDDEV(X), without COUNT(X) or SUM(X)"
*Cause: Incremental refresh of summaries requires a COUNT(X) column in order to incrementally
refresh AVG(X). It requires both SUM(X) and COUNT(X) columns in order to
in refresh STDDEV(X) or VARIANCE(X)
*Action: Make sure that the required columns are part of the summary definition if incremental
refresh capability is desired.

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