CREATE TABLE category
(id text PRIMARY KEY,
 name text NOT NULL);

CREATE TABLE placement
(id SERIAL PRIMARY KEY,
 category text NOT NULL REFERENCES category (id),
 shelf text NOT NULL);

CREATE TABLE bookseries
(id text PRIMARY KEY,
 title text NOT NULL);

CREATE TABLE book
(isbn text PRIMARY KEY,
 id text,
 title text NOT NULL,
 subtitle text,
 category text NOT NULL REFERENCES category (id),
 publisher text,
 published_year integer,
 edition text,
 pages integer,
 series text REFERENCES bookseries (id),
 description text); -- TODO: bilde?

CREATE TABLE alternative_title
(id SERIAL PRIMARY KEY,
 book text NOT NULL REFERENCES book (isbn),
 alt_title text NOT NULL);

CREATE TABLE copy
(book text REFERENCES book (isbn),
 number integer,
 owner text,
 PRIMARY KEY(book, number));

CREATE TABLE person
(id text PRIMARY KEY,
 lastname text NOT NULL,
 firstname text NOT NULL);

CREATE TABLE bookrole
(id text PRIMARY KEY,
 name text NOT NULL);

CREATE TABLE bookperson
(id SERIAL PRIMARY KEY,
 book text NOT NULL REFERENCES book (isbn),
 person text NOT NULL REFERENCES person (id),
 relation text NOT NULL REFERENCES bookrole (id));

CREATE TABLE referencetype
(id text PRIMARY KEY,
 name text NOT NULL);

CREATE TABLE bookreference
(id SERIAL PRIMARY KEY,
 book text NOT NULL REFERENCES book (isbn),
 reftype text NOT NULL REFERENCES referencetype (id),
 value text NOT NULL);

CREATE TABLE personreference
(id SERIAL PRIMARY KEY,
 person text NOT NULL REFERENCES person (id),
 reftype text NOT NULL REFERENCES referencetype (id),
 value text NOT NULL);