How to fix the Oracle error QSM-02151: subquery or named view in FROM list and < 9.0 compatibility?

In this post, you’ll learn more about the Oracle ErrorQSM-02151: subquery or named view in FROM list and < 9.0 compatibility with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-02151: subquery or named view in FROM list and < 9.0 compatibility

Reason for the Error QSM-02151: subquery or named view in FROM list and < 9.0 compatibility

You have specified a materialized view that references a subquery or named view in its top level FROM list while running in less than 9.0 compatibility mode.

How to fix the Error QSM-02151: subquery or named view in FROM list and < 9.0 compatibility ?

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

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