Q:

how to add sequence to primary key in plSQL

I'm using pl sql developer 12.what i want is to add the make the primary key sequential using oracle 12' windows and forms , not by scripting. I can't find out how?.
 aslo, how can i make one to one relation between 2 tables (user,role), in user table i added role_id as foreign key; but the relation seem one to many!!!

A:

what I have done lastly is that i downloaded sql developer 64 w, and from it; I connected with the database then I made the column sequential

