ORA-30452: cannot compute AVG(X), VARIANCE

admin

ORA-30452: cannot compute AVG(X), VARIANCE(X) or STDDEV(X), without
COUNT(X) or SUM(X)
Cause: Incremental refreshof 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 therequired columns are part of the summary definition if
incremental refresh capability is desired.