How to fix the Oracle error QSM-02206: PCT FAST REFRESH is not possible because this query join may produce extra duplicate rows?

In this post, you’ll learn more about the Oracle ErrorQSM-02206: PCT FAST REFRESH is not possible because this query join may produce extra duplicate rows with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02206: PCT FAST REFRESH is not possible because this query join may produce extra duplicate rows

Reason for the Error QSM-02206: PCT FAST REFRESH is not possible because this query join may produce extra duplicate rows

The capability in question was not supported because the materialized view contained a join condition that can result in duplicate rows in the materialized view.

How to fix the Error QSM-02206: PCT FAST REFRESH is not possible because this query join may produce extra duplicate rows ?

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

Rephrase the query to avoid the occurrence of duplicate rows in the materialized view.