DID Tables Slepp rev 3

create table countries (id serial unique,country_name text not null,country_prefix text,country_shortname text not null);create table users (id serial unique,username text not null,password text not null,hostip text);create table dids (country_id integer references countries (id),user_id integer references users (id),assigned char constraint assigned in ('Y','N','P'),did text not null);