create sequence reference_types_seq start with 1000;

create table reference_types (
    reference_type_id number(11)   primary key,
    type_label        varchar2(50) default null,
    abbreviation      varchar2(50) default null,
    description       varchar2(50) default null
);

create table reference_codes (
    reference_type_id number(11),
    reference_code    number(11),
    code_label        varchar2(50) default null,
    abbreviation      varchar2(50) default null,
    description       varchar2(50) default null
);

create sequence products_seq start with 1000;

create table products (
    id   number(11)   primary key,
    name varchar2(50) default null
);

create table tariffs (
    tariff_id  number(11),
    start_date date,
    amount     number(11) default null,
    constraint tariffs_pk primary key (tariff_id, start_date)
);

create table product_tariffs (
    product_id        number(11),
    tariff_id         number(11),
    tariff_start_date date,
    constraint product_tariffs_pk primary key (product_id, tariff_id, tariff_start_date)
);

create table suburbs (
    city_id   number(11),
    suburb_id number(11),
    name      varchar2(50) not null,
    constraint suburbs_pk primary key (city_id, suburb_id)
);

create sequence streets_seq start with 1000;

create table streets (
    id        number(11)   primary key,
    city_id   number(11)   not null,
    suburb_id number(11)   not null,
    name      varchar2(50) not null
);

create sequence users_seq start with 1000;

create table users (
    id   number(11)   primary key,
    name varchar2(50) not null
);

create sequence articles_seq start with 1000;

create table articles (
    id   number(11)   primary key,
    name varchar2(50) not null
);

create sequence readings_seq start with 1000;

create table readings (
    id         number(11) primary key,
    user_id    number(11) not null,
    article_id number(11) not null,
    rating     number(11) not null
);

create sequence groups_seq start with 1000;

create table groups (
    id   number(11)   primary key,
    name varchar2(50) not null
);

create table memberships (
    user_id  number(11) not null,
    group_id number(11) not null,
    constraint memberships_pk primary key (user_id, group_id)
);

create sequence membership_statuses_seq start with 1000;

create table membership_statuses (
    id       number(11)   primary key,
    user_id  number(11)   not null,
    group_id number(11)   not null,
    status   varchar2(50) not null
);

create table departments (
    department_id number(11) not null,
    location_id   number(11) not null,
    constraint departments_pk primary key (department_id, location_id)
);

create sequence employees_seq start with 1000;

create table employees (
    id            number(11) not null primary key,
    department_id number(11) default null,
    location_id   number(11) default null
);

create sequence comments_seq start with 1000;

create table comments (
    id          number(11)   not null primary key,
    person_id   number(11)   default null,
    person_type varchar(100) default null,
    hack_id     number(11)   default null
);

create sequence hacks_seq start with 1000;

create table hacks (
    id   number(11)  not null primary key,
    name varchar(50) not null
);

create table restaurants (
    franchise_id number(11) not null,
    store_id     number(11) not null,
    name         varchar(100),
    constraint restaurants_pk primary key (franchise_id, store_id)
);

create table restaurants_suburbs (
    franchise_id number(11) not null,
    store_id     number(11) not null,
    city_id      number(11) not null,
    suburb_id    number(11) not null
);

create sequence dorms_seq start with 1000;

create table dorms (
    id number(11) not null,
    constraint dorms_pk primary key (id)
);

create table rooms (
    dorm_id number(11) not null,
    room_id number(11) not null,
    constraint rooms_pk primary key (dorm_id, room_id)
);

create sequence room_attributes_seq start with 1000;

create table room_attributes (
    id   number(11) not null,
    name varchar(50),
    constraint room_attributes_pk primary key (id)
);

create table room_attribute_assignments (
    dorm_id           number(11) not null,
    room_id           number(11) not null,
    room_attribute_id number(11) not null
);

create sequence students_seq start with 1000;

create table students (
    id number(11) not null,
    constraint students_pk primary key (id)
);

create table room_assignments (
    student_id number(11) not null,
    dorm_id    number(11) not null,
    room_id    number(11) not null
);

create table seats (
    flight_number int not null,
    seat          int not null,
    customer      int,
    primary key (flight_number, seat)
);

create table capitols (
    country varchar2(2000) not null,
    city varchar2(2000) not null,
    primary key (country, city)
);

create table products_restaurants (
    product_id   number(11) not null,
    franchise_id number(11) not null,
    store_id     number(11) not null
);