ORA-00907: "missing right parenthesis" - sql

Question

First of all, I apologize for asking the same question again but the information on the old topics did not work in my oraclesql code and secondly there may be some syntax errors, I learned mysql in school last semester, but now we are learning oraclesql with old mysql information in the lesson, so i am a bit confused.
So my question is i want to create 3 related table (movie-casts-actor) but i am getting missing right parenthesis. trying to connect casts table to movie table with foreign key and actor table to casts table. what am i doing wrong? how spagetti is it?
CREATE TABLE Movie (
movie_id NUMBER(7) NOT NULL,
movie_name varchar2(50) NOT NULL ,
movie_director varchar2(50) NOT NULL ,
movie_year INT(4) NOT NULL ,
movie_duration INT(3) ,
movie_language varchar2(15) ,
movie_rating number(4,2) ,
PRIMARY KEY(movie_id),
CONSTRAINT is_unique UNIQUE(movie_id),
CONSTRAINT movie_id_checker CHECK(movie_id>0 and movie_id<=9999999)
);
CREATE TABLE Casts (
movie_id_fk INT(7) FOREIGN KEY REFERENCES Movie(movie_id) ,
cast_id INT(7) NOT NULL,
actor_fullname varchar2(50) NOT NULL ,
actor_role varchar2(50) ,
PRIMARY KEY(cast_id),
CONSTRAINT is_unique UNIQUE(cast_id),
CONSTRAINT cast_id_checker CHECK(cast_id>0 and cast_id<=9999999)
);
CREATE TABLE Actor (
cast_id_fk INT(7) FOREIGN KEY REFERENCES Casts(cast_id) ,
actor_id INT(7) NOT NULL,
actor_name CHAR(30) ,
actor_surname CHAR(25) ,
actor_gender CHAR(5) ,
actor_age CHAR(3) CONSTRAINT real_age_check CHECK(actor_age>0 AND actor_age<=150),
PRIMARY KEY(actor_id),
CONSTRAINT is_unique UNIQUE(actor_id),
CONSTRAINT actor_id_checker CHECK(actor_id>0 and actor_id<=9999999)
)

Answer 1

The errors are:
INT or NUMBER(4,0) and not INT(4)
You cannot have a unique key and a primary key on the same column.
An inline foreign key just need the REFERENCES keyword and does not need FOREIGN KEY.
Other issues:
You probably don't want actor name/surname as fixed-length CHAR strings and want to us variable-length VARCHAR2.
You probably want gender to be a code from a fixed list (which can be as long or as short as you find appropriate to describe the actors) rather than as a string.
You probably don't want to have an AGE column as that will be out of date as soon as the first birthday of an actor occurs; instead have a DATE_OF_BIRTH column that is a DATE data type and then you can calculate the age as and when necessary.
Using the table name as a prefix for every column is a waste of key strokes; you would be better to just name the columns for what they are without the prefix. Similar with fk as a suffix.
If you are using a NUMBER(7,0) for id values then you don't need to check that it is less than or equal to 9999999 as it is impossible to be a greater value; however, you can have zero or negative values so the check constraint for the lower bound may still be valid.
If you are using Oracle 12c or later then you should probably be using an IDENTITY column for the id values unless you are taking the id values from a 3rd party.
CREATE TABLE Movie (
id NUMBER(7,0) NOT NULL,
name varchar2(50) NOT NULL ,
director varchar2(50) NOT NULL ,
year NUMBER(4,0) NOT NULL ,
duration NUMBER(3,0),
language varchar2(15) ,
rating number(4,2) ,
PRIMARY KEY(id),
CONSTRAINT movie_id_checker CHECK(id>0)
);
CREATE TABLE Casts (
movie_id INT REFERENCES Movie(id) ,
id NUMBER(7,0) NOT NULL,
fullname varchar2(50) NOT NULL ,
role varchar2(50) ,
PRIMARY KEY(id),
CONSTRAINT cast_id_checker CHECK(id>0)
);
CREATE TABLE Actor (
cast_id NUMBER(7,0) REFERENCES Casts(id) ,
id NUMBER(7,0) NOT NULL,
name VARCHAR2(30) ,
surname VARCHAR2(25) ,
gender CHAR(1)
CHECK ( gender IN ( 'M', 'F', 'X', 'Y', 'Z' ) ),
date_of_birth DATE
CONSTRAINT real_age_check CHECK(date_of_birth >= DATE '1870-01-01' ),
PRIMARY KEY(id),
CONSTRAINT actor_id_checker CHECK(id>0)
);
db<>fiddle here