Complete Step 2.3 and Step 2.4
This commit is contained in:
Higor
@@ -13,7 +13,7 @@ CREATE TABLE pet.core_user (
|
||||
name String,
|
||||
age Int32,
|
||||
email String,
|
||||
registration_date Date
|
||||
registration_date DateTime64(3, 'UTC')
|
||||
)
|
||||
ENGINE = MergeTree
|
||||
ORDER BY user_id;
|
||||
@@ -43,7 +43,7 @@ CREATE TABLE pet.core_fact_lesson_views (
|
||||
user_id Int32,
|
||||
lesson_id Int32,
|
||||
course_id Int32,
|
||||
viewed_at DateTime64(3)
|
||||
viewed_at DateTime64(3, 'UTC')
|
||||
)
|
||||
ENGINE = MergeTree
|
||||
ORDER BY user_id;
|
||||
@@ -51,10 +51,9 @@ ORDER BY user_id;
|
||||
-- Таблица enrollments из GP
|
||||
|
||||
CREATE TABLE pet.core_enrollments (
|
||||
id Int32,
|
||||
user_id Int32,
|
||||
course_id Int32,
|
||||
enrolled_at Date
|
||||
enrolled_at DateTime64(3, 'UTC')
|
||||
)
|
||||
ENGINE = MergeTree
|
||||
ORDER BY user_id;
|
||||
@@ -122,3 +121,162 @@ GROUP BY
|
||||
flv.course_id,
|
||||
c.title;
|
||||
|
||||
-- Задание 3: Создай витрину inactive_users_summary
|
||||
|
||||
-- Создаем пустую таблицу inactive_users_summary(структуру витрины)
|
||||
|
||||
CREATE TABLE pet.inactive_users_summary
|
||||
(
|
||||
user_id UInt32,
|
||||
name String,
|
||||
email String,
|
||||
age UInt8,
|
||||
registered_courses_count UInt32,
|
||||
registration_date DateTime64(3, 'UTC')
|
||||
)
|
||||
ENGINE = MergeTree
|
||||
ORDER BY (user_id);
|
||||
|
||||
-- Создаем Materialized View
|
||||
|
||||
CREATE MATERIALIZED VIEW pet.mv_inactive_users_summary
|
||||
TO pet.inactive_users_summary
|
||||
AS
|
||||
SELECT
|
||||
u.user_id AS user_id,
|
||||
u.name AS name,
|
||||
u.email AS email,
|
||||
u.age AS age,
|
||||
countDistinct(e.course_id) AS registered_courses_count,
|
||||
u.registration_date AS registration_date
|
||||
FROM pet.core_user AS u
|
||||
LEFT JOIN pet.core_enrollments AS e ON u.user_id = e.user_id
|
||||
WHERE u.user_id NOT IN (
|
||||
SELECT DISTINCT user_id
|
||||
FROM pet.core_fact_lesson_views
|
||||
)
|
||||
GROUP BY
|
||||
u.user_id,
|
||||
u.name,
|
||||
u.email,
|
||||
u.age,
|
||||
u.registration_date;
|
||||
|
||||
-- Вставляем данные в таблицу inactive_users_summary
|
||||
|
||||
INSERT INTO pet.inactive_users_summary
|
||||
SELECT
|
||||
u.user_id,
|
||||
u.name,
|
||||
u.email,
|
||||
u.age,
|
||||
countDistinct(e.course_id) AS registered_courses_count,
|
||||
u.registration_date
|
||||
FROM pet.core_user AS u
|
||||
LEFT JOIN pet.core_enrollments AS e
|
||||
ON u.user_id = e.user_id
|
||||
WHERE u.user_id NOT IN (
|
||||
SELECT DISTINCT user_id
|
||||
FROM pet.core_fact_lesson_views
|
||||
)
|
||||
/*
|
||||
* этот подзапрос WHERE... просто выбрасывает всех, кто хоть раз что‑то посмотрел,
|
||||
* независимо от количества строк и особенностей JOIN’ов.
|
||||
*/
|
||||
GROUP BY
|
||||
u.user_id,
|
||||
u.name,
|
||||
u.email,
|
||||
u.age,
|
||||
u.registration_date;
|
||||
|
||||
|
||||
-- Задание 4: Создай витрину course_completion_rate
|
||||
|
||||
CREATE TABLE pet.course_completion_rate
|
||||
(
|
||||
user_id UInt32,
|
||||
user_name String,
|
||||
course_id UInt32,
|
||||
course_title String,
|
||||
lessons_in_course UInt32,
|
||||
lessons_viewed UInt32,
|
||||
completion_rate Float32
|
||||
)
|
||||
ENGINE = MergeTree
|
||||
ORDER BY (user_id, course_id);
|
||||
|
||||
-- Создаем Materialized View
|
||||
|
||||
CREATE MATERIALIZED VIEW pet.mv_course_completion_rate
|
||||
TO pet.course_completion_rate
|
||||
AS
|
||||
SELECT
|
||||
u.user_id AS user_id,
|
||||
u.name AS user_name,
|
||||
c.course_id AS course_id,
|
||||
c.title AS course_title,
|
||||
countDistinct(l.lesson_id) AS lessons_in_course,
|
||||
countDistinct(flv.lesson_id) AS lessons_viewed,
|
||||
if(countDistinct(l.lesson_id) = 0,0,
|
||||
round(countDistinct(flv.lesson_id) * 1.0 / countDistinct(l.lesson_id),2)
|
||||
) AS completion_rate
|
||||
FROM pet.core_enrollments AS e
|
||||
JOIN pet.core_user AS u ON e.user_id = u.user_id
|
||||
JOIN pet.core_course AS c ON e.course_id = c.course_id
|
||||
JOIN pet.core_lesson AS l ON c.course_id = l.course_id
|
||||
LEFT JOIN pet.core_fact_lesson_views AS flv
|
||||
ON flv.user_id = e.user_id
|
||||
AND flv.course_id = e.course_id
|
||||
GROUP BY
|
||||
u.user_id,
|
||||
u.name,
|
||||
c.course_id,
|
||||
c.title;
|
||||
|
||||
-- Вставляем данные в таблицу pet.course_completion_rate
|
||||
INSERT INTO pet.course_completion_rate
|
||||
-- Создаем две временные таблицы:
|
||||
-- 1) Сколько уроков в каждом курсе
|
||||
WITH
|
||||
lessons_per_course AS (
|
||||
SELECT
|
||||
course_id,
|
||||
countDistinct(lesson_id) AS lessons_in_course
|
||||
FROM pet.core_lesson
|
||||
GROUP BY course_id
|
||||
),
|
||||
-- 2) Сколько уроков каждого курса посмотрел пользователь
|
||||
views_per_user_course AS (
|
||||
SELECT
|
||||
user_id,
|
||||
course_id,
|
||||
countDistinct(lesson_id) AS lessons_viewed
|
||||
FROM pet.core_fact_lesson_views
|
||||
GROUP BY user_id, course_id
|
||||
)
|
||||
-- Основной запрос
|
||||
SELECT
|
||||
u.user_id,
|
||||
u.name AS user_name,
|
||||
c.course_id,
|
||||
c.title AS course_title,
|
||||
lpc.lessons_in_course,
|
||||
coalesce(vpc.lessons_viewed, 0) AS lessons_viewed,
|
||||
ROUND(
|
||||
COALESCE(
|
||||
NULLIF(coalesce(vpc.lessons_viewed, 0) * 1.0, 0)
|
||||
/ NULLIF(lpc.lessons_in_course * 1.0, 0),
|
||||
0
|
||||
),
|
||||
2
|
||||
) AS completion_rate
|
||||
FROM pet.core_user AS u
|
||||
JOIN pet.core_enrollments AS e ON u.user_id = e.user_id
|
||||
JOIN pet.core_course AS c ON e.course_id = c.course_id
|
||||
JOIN lessons_per_course AS lpc ON c.course_id = lpc.course_id
|
||||
LEFT JOIN views_per_user_course AS vpc ON vpc.user_id = u.user_id AND vpc.course_id = c.course_id
|
||||
ORDER BY
|
||||
u.user_id,
|
||||
c.course_id;
|
||||
|
||||
|
||||
Reference in New Issue
Block a user