Oracle Error QSM-02136: agg(expr) requires correspondng VARIANCE(expr) function

Oracle Error Message

QSM-02136: agg(expr) requires correspondng VARIANCE(expr) function

Reason for the Error

The capability in question is not supported when the materialized view uses certain aggregate functions but omits an invocation of the VARIANCE function on the same argument.

Solution

Add the VARIANCE function to the select list.