How to fix the Oracle error ORA-02331: cannot create constraint on column of datatype string?

In this post, you’ll learn more about the Oracle ErrorORA-02331: cannot create constraint on column of datatype string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-02331: cannot create constraint on column of datatype string

Reason for the Error ORA-02331: cannot create constraint on column of datatype string

An attempt was made to create a constraint on a column posessing a non-constrainable datatype — VARRAY, nested table, object, LOB, FILE, or REF.

How to fix the Error ORA-02331: cannot create constraint on column of datatype string ?

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

Change the column datatype, or remove the constraint.