How to fix the Oracle error ORA-39321: Cannot alter functional index or virtual expression column: string?

In this post, you’ll learn more about the Oracle ErrorORA-39321: Cannot alter functional index or virtual expression column: string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-39321: Cannot alter functional index or virtual expression column: string

Reason for the Error ORA-39321: Cannot alter functional index or virtual expression column: string

Altered column was referenced in a virtual column or functional index expression. There is no SQL ALTER statement to change a column which is referenced in one of these types of expressions.

How to fix the Error ORA-39321: Cannot alter functional index or virtual expression column: string ?

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

The difference cannot be eliminated with a SQL ALTER statement.