How to fix the Oracle error PLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy?

In this post, you’ll learn more about the Oracle ErrorPLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy

Reason for the Error PLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy

An attempt was made to define a MAP or ORDER method in a subtype.

How to fix the Error PLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy ?

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

Define the MAP or ORDER method in the root of the subtype hierarchy. You can override MAP methods in subtypes.