How to fix the Oracle error ORA-12015: cannot create a fast refresh materialized view from a complex query?

In this post, you’ll learn more about the Oracle ErrorORA-12015: cannot create a fast refresh materialized view from a complex query with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-12015: cannot create a fast refresh materialized view from a complex query

Reason for the Error ORA-12015: cannot create a fast refresh materialized view from a complex query

Neither ROWIDs and nor primary key constraints are supported for complex queries.

How to fix the Error ORA-12015: cannot create a fast refresh materialized view from a complex query ?

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

Reissue the command with the REFRESH FORCE or REFRESH COMPLETE option or create a simple materialized view.