In this post, you’ll learn more about the Oracle ErrorORA-32306: updatable materialized views with user-defined types must use SELECT * with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-32306: updatable materialized views with user-defined types must use SELECT *
Reason for the Error ORA-32306: updatable materialized views with user-defined types must use SELECT *
An attempt was made to create an updatable materialized view with user-defined types where the definition query did not use SELECT * at the topmost level.
How to fix the Error ORA-32306: updatable materialized views with user-defined types must use SELECT * ?
You can fix this error in Oracle by following the below steps
Rewrite the definition query so that SELECT * is used at the topmost level.