How to fix the Oracle error ORA-30401: JOIN KEY columns must be non-null?

In this post, you’ll learn more about the Oracle ErrorORA-30401: JOIN KEY columns must be non-null with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30401: JOIN KEY columns must be non-null

Reason for the Error ORA-30401: JOIN KEY columns must be non-null

The dimension statement failed because the column(s) in the JOIN KEY clause permitted NULL values. The JOIN KEY columns are related to the columns of the dimension’s skip levels in one or both of the following ways:

1. A skip level is defined over one or more of the JOIN KEY columns.

2. The attribute clauses of a skip level determine one or more of the JOIN KEY columns.

How to fix the Error ORA-30401: JOIN KEY columns must be non-null ?

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

Modify the JOIN KEY columns so that they do not allow NULL values.