How to fix the Oracle error ORA-30366: child JOIN KEY columns not in same relation as child level?

In this post, you’ll learn more about the Oracle ErrorORA-30366: child JOIN KEY columns not in same relation as child level with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30366: child JOIN KEY columns not in same relation as child level

Reason for the Error ORA-30366: child JOIN KEY columns not in same relation as child level

The relation of the child columns on the left side of the JOIN KEY clause differed from that of that child level.

How to fix the Error ORA-30366: child JOIN KEY columns not in same relation as child level ?

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

Specify the correct child columns in the JOIN KEY clause.