[SQL] how to create fk int in TABLE

[pablobion]

1. Filme
2. COD (int, pk)
3. nome(varchar 20, not null)
4. nascimento(datetime, not null)
5. obs(tinybit, not null)
6. obs2(int, fk, not null)

I thought of something of the type

create table filme (
COD int PRIMARY KEY AUTO_INCREMENT,
nome varchar(200) NOT NULL,
nascimento datetime NOT NULL,
obs tinyint NOT NULL,
obs2 int NOT NULL
)



I do not know how to create fk ... how do i create an int fk?