Merge pull request 'Alex' (#31) from Alex into main

Reviewed-on: https://gitea.de-infra.servehttp.com/de-infrastructure/DWH/pulls/31
2025-12-21 18:45:10 +04:00
parent 05801b9de9 37601f0c20
commit b2fc875eba
1 changed files with 86 additions and 0 deletions
@@ -0,0 +1,86 @@
+-- Этап 1: Создание таблиц и связей
+-- Создай все таблицы в SQL
+-- Заполни данными (INSERT)
+-- Настрой внешние ключи
+--Таблица 1: 
+   CREATE TABLE agoncharov.courses (
+	id int4 NOT NULL,
+	title varchar(50) NOT NULL,
+	category varchar(50) NOT NULL,
+	created_at date NOT NULL,
+	CONSTRAINT courses_pkey PRIMARY KEY (id)
+);	
+		insert into (id,title,category,created_at)
+		values (1,'SQL для начинающих','data','2023-01-01'),
+		(2,'Python для анализа данных','programming','2023-01-15'),
+		(3,'BI с нуля','business','2023-03-01');
+
+-- Таблица 2:
+CREATE TABLE agoncharov.enrollmets (
+	id int4 NOT NULL,
+	user_id int4 NULL,
+	course_id int4 NULL,
+	enrolled_at date NULL,
+	CONSTRAINT enrollmets_pkey PRIMARY KEY (id)
+);
+ALTER TABLE agoncharov.enrollmets ADD CONSTRAINT enrollmets_course_id_fkey FOREIGN KEY (course_id) REFERENCES agoncharov.courses(id);
+ALTER TABLE agoncharov.enrollmets ADD CONSTRAINT enrollmets_user_id_fkey FOREIGN KEY (user_id) REFERENCES agoncharov.users(id);
+
+INSERT INTO (id,user_id,course_id,enrolled_at)
+values (1,1,1,'2023-01-15'),(2,1,2,'2023-02-01'),(3,2,1,'2023-01-20'),
+(4,3,2,'2023-03-05'),(5,4,3,'2023-04-01');
+
+-- Таблица 3 :
+CREATE TABLE agoncharov.lesson_views (
+	id int4 NOT NULL,
+	user_id int4 NULL,
+	lesson_id int4 NULL,
+	viewed_at timestamp NULL,
+	CONSTRAINT lesson_views_pkey PRIMARY KEY (id)
+);
+
+
+-- agoncharov.lesson_views внешние включи
+
+ALTER TABLE agoncharov.lesson_views ADD CONSTRAINT lesson_views_lesson_id_fkey FOREIGN KEY (lesson_id) REFERENCES agoncharov.lessons(id);
+ALTER TABLE agoncharov.lesson_views ADD CONSTRAINT lesson_views_user_id_fkey FOREIGN KEY (user_id) REFERENCES agoncharov.users(id);
+
+insert into (id,user_id,lesson_id,viewed_at)
+values (1,1,1,'2023-01-16 10:00:00'),(2,1,2,'2023-01-16 10:15:00'),
+(3,2,1,'2023-01-21 09:00:00'), (4,3,3,'2023-04-06 12:00:00'),
+(5,4,4,'2023-04-02 10:00:00'),(6,4,5,'2023-04-03 10:00:00');
+
+-- Таблица 4
+CREATE TABLE agoncharov.lessons (
+	id int4 NOT NULL,
+	course_id int4 NULL,
+	title varchar(50) NOT NULL,
+	duration_min int4 NOT NULL,
+	CONSTRAINT lessons_pkey PRIMARY KEY (id)
+);
+
+
+-- agoncharov.lessons внешние включи
+
+ALTER TABLE agoncharov.lessons ADD CONSTRAINT lessons_course_id_fkey FOREIGN KEY (course_id) REFERENCES agoncharov.courses(id);
+
+insert into (id,course_id,title,duration_min)
+values (1,1,1,'SELECT и FROM',10),(2,2,1,'JOIN',15),
+(3,3,2,'PANDAS',20),(4,4,3,'Основы BI',12),(5,5,3,'Метрики и дашборды',18);
+
+-- Таблица 5:
+CREATE TABLE agoncharov.users (
+	id int4 NOT NULL,
+	"name" varchar(50) NOT NULL,
+	age int4 NULL,
+	email varchar(100) NULL,
+	registration_date date NULL,
+	CONSTRAINT users_pkey PRIMARY KEY (id)
+);
+
+INSERT INTO (id,name,age,email,registration_date)
+values (1,'Alice',25,'alice@mail.com','2023-01-10'),
+(2,'Bob',30,'bob@gmail.com','2023-02-05'),
+(3,'Charlie',22,'charlie@mail.com','2023-02-20'),
+(4,'Diana',28,'diana@mail.com','2023-03-01'),
+(5,'Ethan',35,'ethan@gmail.com','2023-03-10');