How to fix the Oracle error QSM-02018: subquery present in the WHERE clause?

In this post, you’ll learn more about the Oracle ErrorQSM-02018: subquery present in the WHERE clause with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02018: subquery present in the WHERE clause

Reason for the Error QSM-02018: subquery present in the WHERE clause

The capability in question is not supported when the materialized view uses a subquery in the WHERE clause.

How to fix the Error QSM-02018: subquery present in the WHERE clause ?

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

Re-phrase the query to avoid the subquery in the WHERE clause.