How to fix the Oracle error QSM-02148: many to many subquery joins require 9.0 compatibility or higher?

In this post, you’ll learn more about the Oracle ErrorQSM-02148: many to many subquery joins require 9.0 compatibility or higher with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02148: many to many subquery joins require 9.0 compatibility or higher

Reason for the Error QSM-02148: many to many subquery joins require 9.0 compatibility or higher

You have specified a many to many join in your materialized view while running in less than 9.0 compatibility mode.

How to fix the Error QSM-02148: many to many subquery joins require 9.0 compatibility or higher ?

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

Set your compatibility mode to 9.0 or higher or restructure the materialized view query.