--создаем таблицы для raw слоя с DISTRIBUTED REPLICATED, т.к. таблицы довольно маленькие 


CREATE TABLE raw.users (
	id BIGINT PRIMARY KEY, 
	name VARCHAR(100), 
	age INT, 
	email VARCHAR(255) UNIQUE, 
	registration_date DATE NOT NULL
)
DISTRIBUTED REPLICATED;

CREATE TABLE raw.courses(
	id BIGINT PRIMARY KEY,
	title TEXT NOT NULL,
	category VARCHAR(255) CHECK (category IN ('data', 'programming', 'business')),
	created_at DATE NOT NULL
	)
	DISTRIBUTED REPLICATED;

CREATE TABLE raw.lessons(
	id BIGINT PRIMARY KEY, 
	course_id INT NOT NULL,
	title TEXT NOT NULL, 
	duration_min INT NOT NULL
	)
	DISTRIBUTED REPLICATED;


CREATE TABLE raw.enrollments(
	id BIGINT PRIMARY KEY, 
	user_id INT NOT NULL,
	course_id INT NOT NULL,
	enrolled_at DATE NOT NULL
	)
	DISTRIBUTED REPLICATED;

CREATE TABLE raw.lesson_views(
	id BIGINT PRIMARY KEY, 
	user_id INT NOT NULL,
	lesson_id INT NOT NULL,
	viewed_at TIMESTAMP NOT NULL
	)
	DISTRIBUTED REPLICATED;