postgresql – How to insert duplicate values into a primary key column in a table in postgres?

I had a table as below

CREATE TABLE test (
    id character varying(300)  ,
    name     character varying(400) 
    );
ALTER TABLE test ADD PRIMARY KEY (Id);

I had the following insert statements

insert into test(id,name)values('1','ram')`;
insert into test(id,name)values('1','sam')`;

In the above insert statements i am trying to insert duplicate ‘id’. I am getting the error saying duplicate value the value already exits.

Is their any other way that we can declare a column as primary key and duplicate the primary key