How to fix the Oracle error ORA-30365: left relation in the JOIN KEY clause cannot be same as right?

In this post, you’ll learn more about the Oracle ErrorORA-30365: left relation in the JOIN KEY clause cannot be same as right with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30365: left relation in the JOIN KEY clause cannot be same as right

Reason for the Error ORA-30365: left relation in the JOIN KEY clause cannot be same as right

The relation of the child columns on the left side of the JOIN KEY clause was the same as that of the parent level on the right side.

How to fix the Error ORA-30365: left relation in the JOIN KEY clause cannot be same as right ?

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

Remove the JOIN KEY clause. It is not required or allowed when the child and the parent are in the same relation.