How to fix the Oracle error ORA-22856: cannot add columns to object tables?

In this post, you’ll learn more about the Oracle ErrorORA-22856: cannot add columns to object tables with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-22856: cannot add columns to object tables

Reason for the Error ORA-22856: cannot add columns to object tables

An attempt was made to add columns to an object table. Object tables cannot be altered to add columns since its definition is based on an object type.

How to fix the Error ORA-22856: cannot add columns to object tables ?

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

Create a new type with additional attributes, and use the new type to create an object table. The new object table will have the desired columns.