How to fix the Oracle error QSM-01123: self-join algorithm could not resolve multiple instances?

In this post, you’ll learn more about the Oracle ErrorQSM-01123: self-join algorithm could not resolve multiple instances with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-01123: self-join algorithm could not resolve multiple instances

Reason for the Error QSM-01123: self-join algorithm could not resolve multiple instances

The generalized self-join algorithm could not resolve the mutliple instances, likely due to mismatch in joins or measures

How to fix the Error QSM-01123: self-join algorithm could not resolve multiple instances ?

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

Consider using aliases in the query to match with the aliases in the materialized view