Как привести эту базу данных к 3 нормальной форме?

CREATE TABLE Kinostudija
(
Studija_ID VARCHAR (30) PRIMARY KEY,
Nazvanie VARCHAR (255),
Adres VARCHAR (255),
God INT
)
 
CREATE TABLE Rezhiser 
(
Rezhiser_ID VARCHAR (30) PRIMARY KEY,
Name VARCHAR (30),
Surname VARCHAR (30),
Data_rozhdenia VARCHAR (30)
)
 
CREATE TABLE Film
(
Film_ID VARCHAR (30) PRIMARY KEY,
Strana VARCHAR (30),
Nazvanie VARCHAR (255),
Prodolzhitelnost VARCHAR (30),
Zhanr VARCHAR (30),
God INT,
Film_snjat VARCHAR (30) FOREIGN KEY REFERENCES Kinostudija, -- !!!!!!chto-to ne to, naverno o_o
Rezhiser_snimal VARCHAR (30) FOREIGN KEY REFERENCES Rezhiser
)
 
CREATE TABLE Statistika_1 (
Studija_ID VARCHAR (30) FOREIGN KEY REFERENCES Kinostudija,
Snjatie_filmi VARCHAR (30))
 
 
 
CREATE TABLE Akter 
(
Akter_ID VARCHAR (30) PRIMARY KEY,
Name VARCHAR (30),
Surname VARCHAR (30),
God INT
)
 
CREATE TABLE Uchastie_aktera_v_filmah 
(
Akter_ID VARCHAR (30) FOREIGN KEY REFERENCES Akter,
Kolichestvo_rolej INT
)
 
CREATE TABLE Igra_v_filme
(
Film_ID VARCHAR (30) FOREIGN KEY REFERENCES Film,
Akter_ID VARCHAR (30) FOREIGN KEY REFERENCES Akter
)