How to fix the Oracle error PLS-00506: User Defined Constrained Subtypes are disallowed?

In this post, you’ll learn more about the Oracle ErrorPLS-00506: User Defined Constrained Subtypes are disallowed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00506: User Defined Constrained Subtypes are disallowed

Reason for the Error PLS-00506: User Defined Constrained Subtypes are disallowed

An attempt was made to define a constrained subtype, but only unconstrained subtypes are allowed in this release of PL/SQL. For example, the following type definition is illegal: SUBTYPE Acronym IS VARCHAR2(5); — illegal

How to fix the Error PLS-00506: User Defined Constrained Subtypes are disallowed ?

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

Remove the illegal type constraint.