How to fix the Oracle error QSM-02059: join may produce duplicate rows in mv?

In this post, you’ll learn more about the Oracle ErrorQSM-02059: join may produce duplicate rows in mv with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02059: join may produce duplicate rows in mv

Reason for the Error QSM-02059: join may produce duplicate rows in mv

The capability in question is not supported when the materialized view contains a join condition that can result in duplicate rows in the materialized view.

How to fix the Error QSM-02059: join may produce duplicate rows in mv ?

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

Re-phrase the query to avoid the occurrence of duplicate rows in the materialized view.