How to fix the Oracle error ORA-32311: materialized view definition query selects an unsupported user-defined type?

In this post, you’ll learn more about the Oracle ErrorORA-32311: materialized view definition query selects an unsupported user-defined type with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-32311: materialized view definition query selects an unsupported user-defined type

Reason for the Error ORA-32311: materialized view definition query selects an unsupported user-defined type

An attempt was made in the definition query to select an embedded user-defined type, function returning a user-defined type, or a function whose arguments are user-defined types.

How to fix the Error ORA-32311: materialized view definition query selects an unsupported user-defined type ?

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

Rewrite the definition query to exclude these unsupported user-defined types.