How to fix the Oracle error QSM-02121: set operator in a context not supported for fast refresh?

In this post, you’ll learn more about the Oracle ErrorQSM-02121: set operator in a context not supported for fast refresh with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02121: set operator in a context not supported for fast refresh

Reason for the Error QSM-02121: set operator in a context not supported for fast refresh

The capability in question is not supported when the materialized view uses a set operator in this context.

How to fix the Error QSM-02121: set operator in a context not supported for fast refresh ?

You can fix this error in Oracle by following the below steps

Re-phrase the query to avoid the use of the set operator.