create table czytelnicy
(
id_czytelnik serial not null,
imie varchar,
Nazwisko varchar,
numer_albumu integer,
primary key(id_czytelnik),
unique (id_czytelnik)
);
create table wypozyczenia
(
id_wypozyczenia serial not null,
id_ksiazki int,
id_czytelnik int not null,
data_wypozyczenia date,
data_zwrotu date,
foreign key (id_czytelnik) references czytelnicy(id) on delete no action,
foreign key (id_ksiazki) references ksiazki(id) on delete no action,
primary key(id_wypozyczenia),
unique (id_wypozyczenia)
);
create table ksiazki
(
id_ksiazki serial not null,
isbn int,
tytul varchar,
autor varchar,
wydawnictwo varchar,
rok_wydania int,
primary key(id_ksiazki),
unique (id_ksiazki, isbn)
);
alter table wypozyczenia add id_czytelnik int not null;
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