How to fix the Oracle error QSM-02173: the unique constraints does not exist on the join columns of the inner table?

In this post, you’ll learn more about the Oracle ErrorQSM-02173: the unique constraints does not exist on the join columns of the inner table with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02173: the unique constraints does not exist on the join columns of the inner table

Reason for the Error QSM-02173: the unique constraints does not exist on the join columns of the inner table

If there are outer joins, unique constraints must exist on the join columns of the inner table. Othwerwise, the materialized view can not be fast refreshable.

How to fix the Error QSM-02173: the unique constraints does not exist on the join columns of the inner table ?

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

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