How to fix the Oracle error ORA-02437: cannot validate (string.string) – primary key violated?

In this post, you’ll learn more about the Oracle ErrorORA-02437: cannot validate (string.string) – primary key violated with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-02437: cannot validate (string.string) – primary key violated

Reason for the Error ORA-02437: cannot validate (string.string) – primary key violated

attempted to validate a primary key with duplicate values or null values.

How to fix the Error ORA-02437: cannot validate (string.string) – primary key violated ?

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

remove the duplicates and null values before enabling a primary key.