How to fix the Oracle error QSM-01247: join back cannot be done on a materialized view that does not have an aggregate (string)?

In this post, you’ll learn more about the Oracle ErrorQSM-01247: join back cannot be done on a materialized view that does not have an aggregate (string) with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-01247: join back cannot be done on a materialized view that does not have an aggregate (string)

Reason for the Error QSM-01247: join back cannot be done on a materialized view that does not have an aggregate (string)

Query Rewrite can occur by means of a complex join back only during a MAV rewrite.

How to fix the Error QSM-01247: join back cannot be done on a materialized view that does not have an aggregate (string) ?

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

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