SQL code to create Tables

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SQL code to create Tables, copy below:
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CREATE TABLE regions (
region_id INT IDENTITY(1,1) PRIMARY KEY,
region_name VARCHAR (25) DEFAULT NULL
);

CREATE TABLE countries (
country_id CHAR (2) PRIMARY KEY,
country_name VARCHAR (40) DEFAULT NULL,
region_id INT NOT NULL,
FOREIGN KEY (region_id) REFERENCES regions (region_id) ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TABLE locations (
location_id INT IDENTITY(1,1) PRIMARY KEY,
street_address VARCHAR (40) DEFAULT NULL,
postal_code VARCHAR (12) DEFAULT NULL,
city VARCHAR (30) NOT NULL,
state_province VARCHAR (25) DEFAULT NULL,
country_id CHAR (2) NOT NULL,
FOREIGN KEY (country_id) REFERENCES countries (country_id) ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TABLE jobs (
job_id INT IDENTITY(1,1) PRIMARY KEY,
job_title VARCHAR (35) NOT NULL,
min_salary DECIMAL (8, 2) DEFAULT NULL,
max_salary DECIMAL (8, 2) DEFAULT NULL
);

CREATE TABLE departments (
department_id INT IDENTITY(1,1) PRIMARY KEY,
department_name VARCHAR (30) NOT NULL,
location_id INT DEFAULT NULL,
FOREIGN KEY (location_id) REFERENCES locations (location_id) ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TABLE employees (
employee_id INT IDENTITY(1,1) PRIMARY KEY,
first_name VARCHAR (20) DEFAULT NULL,
last_name VARCHAR (25) NOT NULL,
email VARCHAR (100) NOT NULL,
phone_number VARCHAR (20) DEFAULT NULL,
hire_date DATE NOT NULL,
job_id INT NOT NULL,
salary DECIMAL (8, 2) NOT NULL,
manager_id INT DEFAULT NULL,
department_id INT DEFAULT NULL,
FOREIGN KEY (job_id) REFERENCES jobs (job_id) ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (department_id) REFERENCES departments (department_id) ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (manager_id) REFERENCES employees (employee_id)
);

CREATE TABLE dependents (
dependent_id INT IDENTITY(1,1) PRIMARY KEY,
first_name VARCHAR (50) NOT NULL,
last_name VARCHAR (50) NOT NULL,
relationship VARCHAR (25) NOT NULL,
employee_id INT NOT NULL,
FOREIGN KEY (employee_id) REFERENCES employees (employee_id) ON DELETE CASCADE ON UPDATE CASCADE
);

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