Merge pull request 'OS-330' (#45) from OS-330 into main
Reviewed-on: https://gitea.de-infra.servehttp.com/de-infrastructure/DWH/pulls/45
This commit is contained in:
@@ -0,0 +1,215 @@
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CREATE TABLE IF NOT EXISTS amaksatov.users (
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id SERIAL PRIMARY KEY,
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name VARCHAR(100),
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age INT,
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email VARCHAR(255),
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registration_date DATE
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);
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CREATE TABLE IF NOT EXISTS amaksatov.courses (
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id SERIAL PRIMARY KEY,
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title VARCHAR(255),
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category VARCHAR(100),
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created_at DATE
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);
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CREATE TABLE IF NOT EXISTS amaksatov.lessons (
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id SERIAL PRIMARY KEY,
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course_id INT,
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title VARCHAR(255),
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duration_min INT,
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FOREIGN KEY (course_id) REFERENCES amaksatov.courses(id)
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);
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CREATE TABLE IF NOT EXISTS amaksatov.enrollments (
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id SERIAL PRIMARY KEY,
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user_id INT,
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course_id INT,
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enrolled_at date,
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FOREIGN KEY (user_id) REFERENCES amaksatov.users(id),
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FOREIGN KEY (course_id) REFERENCES amaksatov.courses(id)
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);
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CREATE TABLE IF NOT EXISTS amaksatov.lesson_views (
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id SERIAL PRIMARY KEY,
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user_id INT,
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lesson_id INT,
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viewed_at TIMESTAMP,
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FOREIGN KEY (user_id) REFERENCES amaksatov.users(id),
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FOREIGN KEY (lesson_id) REFERENCES amaksatov.lessons(id)
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);
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INSERT
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INTO
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amaksatov.users (
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name,
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age,
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email,
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registration_date
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)
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VALUES (
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'Alice',
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25,
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'alice@mail.com',
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'2023-01-10'
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),
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(
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'Bob',
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30,
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'bob@gmail.com',
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'2023-02-05'
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),
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(
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'Charlie',
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22,
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'charlie@mail.com',
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'2023-02-20'
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),
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(
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'Diana',
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28,
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'diana@mail.com',
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'2023-03-01'
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),
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(
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'Ethan',
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35,
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'ethan@gmail.com',
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'2023-03-10'
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);
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SELECT * FROM amaksatov.users;
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INSERT
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INTO
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amaksatov.courses (
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title,
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category,
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created_at
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)
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VALUES
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(
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'SQL для начинающих',
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'data',
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'2023-01-01'
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),
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(
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'Python для анализа данных',
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'programming',
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'2023-01-15'
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),
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(
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'BI с нуля',
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'business',
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'2023-03-01'
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);
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INSERT
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INTO
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amaksatov.lessons (
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course_id,
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title,
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duration_min
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)
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VALUES
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(
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1,
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'SELECT и FROM',
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10
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),
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(
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1,
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'JOIN',
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15
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),
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(
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2,
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'Pandas',
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20
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),
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(
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3,
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'Основы BI',
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12
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),
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(
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3,
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'Метрики и дашборды',
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18
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);
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INSERT
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INTO
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amaksatov.enrollments (
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user_id,
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course_id,
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enrolled_at
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)
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VALUES
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(
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1,
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1,
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'2023-01-15'
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),
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(
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1,
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2,
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'2023-02-01'
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),
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(
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2,
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1,
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'2023-01-20'
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),
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(
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3,
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2,
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'2023-03-05'
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),
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(
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4,
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3,
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'2023-04-01'
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);
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INSERT
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INTO
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amaksatov.lesson_views (
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user_id,
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lesson_id,
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viewed_at
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)
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VALUES
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(
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1,
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1,
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'2023-01-16 10:00:00'
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),
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(
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1,
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2,
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'2023-01-16 10:15:00'
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),
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(
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2,
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1,
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'2023-01-21 09:00:00'
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),
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(
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3,
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3,
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'2023-03-06 12:00:00'
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),
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(
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4,
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4,
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'2023-04-02 10:00:00'
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),
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(
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4,
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5,
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'2023-04-03 10:00:00'
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);
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@@ -0,0 +1,68 @@
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CREATE MATERIALIZED VIEW user_activity_summary AS
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SELECT
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u.id AS user_id, -- user_id
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u.name, -- name
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COUNT(DISTINCT e.course_id) AS enrollment_count, -- кол-во записей на курсы
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COUNT(DISTINCT lv.lesson_id) AS viewed_lessons_count, -- кол-во просмотренных уроков
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MAX(lv.viewed_at) AS last_viewed, -- последний просмотр
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MIN(lv.viewed_at) AS first_viewed, -- первый просмотр
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ROUND(COUNT(DISTINCT l.course_id) * 100.0 / COUNT(DISTINCT l.id), 2) || '%' AS engagement_rate -- вовлеченность(процент просмотренных/записанным)
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FROM amaksatov.users u -- основная таблица
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JOIN enrollments e ON e.user_id = u.id -- связь users с enrollments
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LEFT JOIN lesson_views lv ON lv.user_id = e.user_id -- связь lessons с lesson_views
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JOIN lessons l ON l.course_id = e.course_id -- связь уроков с курсами пользователя
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GROUP BY u.id, u.name -- группировка по user_id и name
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ORDER BY user_id; -- сортировка по user_id
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CREATE MATERIALIZED VIEW course_summary AS
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SELECT
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c.id AS course_id,
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c.title AS course_title,
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COUNT(DISTINCT e.user_id) AS unique_users,
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COUNT(DISTINCT l.id) AS lessons_count,
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COUNT(DISTINCT lv.id) AS total_views,
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ROUND(
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CASE
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WHEN COUNT(DISTINCT e.user_id) = 0 THEN NULL
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ELSE COUNT(DISTINCT lv.id) * 1.0 / COUNT(DISTINCT e.user_id)
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END, 2) AS avg_views_per_user,
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MIN(lv.viewed_at) AS first_viewed_at,
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MAX(lv.viewed_at) AS last_viewed_at
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FROM courses c
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LEFT JOIN enrollments e ON e.course_id = c.id
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LEFT JOIN lessons l ON c.id = l.course_id
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LEFT JOIN lesson_views lv ON lv.lesson_id = l.id
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GROUP BY c.id;
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CREATE MATERIALIZED VIEW platform_summary AS
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WITH
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user_stats AS (
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SELECT COUNT(*) AS total_users FROM users
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),
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course_stats AS (
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SELECT COUNT(*) AS total_courses FROM courses
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),
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lesson_stats AS (
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SELECT COUNT(*) AS total_lessons FROM lessons
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),
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view_stats AS (
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SELECT COUNT(*) AS total_views, COUNT(DISTINCT user_id) AS users_with_views
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FROM lesson_views
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)
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SELECT
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u.total_users,
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c.total_courses,
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l.total_lessons,
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v.users_with_views,
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ROUND(l.total_lessons::decimal / NULLIF(c.total_courses, 0), 2) AS avg_lessons_per_course,
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ROUND(v.total_views::decimal / NULLIF(l.total_lessons, 0), 2) AS avg_views_per_lesson
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FROM user_stats u, course_stats c, lesson_stats l, view_stats v;
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