Higor
125 lines
3.0 KiB
SQL
125 lines
3.0 KiB
SQL
CREATE database pet;
|
|
|
|
-- Этап 1
|
|
-- Задание 1
|
|
-- Перенести данные как в пет-проекте с Greenplum
|
|
|
|
-- Создаем таблицы, чтобы потом загрузить в них данные из таблиц GreenPlum
|
|
|
|
-- Таблица user из GP
|
|
|
|
CREATE TABLE pet.core_user (
|
|
user_id Int32,
|
|
name String,
|
|
age Int32,
|
|
email String,
|
|
registration_date Date
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY user_id;
|
|
|
|
-- Таблица course из GP
|
|
CREATE TABLE pet.core_course (
|
|
course_id Int32,
|
|
title String,
|
|
category String
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY course_id;
|
|
|
|
-- Таблица lesson из GP
|
|
CREATE TABLE pet.core_lesson (
|
|
lesson_id Int32,
|
|
title String,
|
|
duration_min Int32,
|
|
course_id Int32
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY lesson_id;
|
|
|
|
-- Таблица fact_lesson_views из GP
|
|
|
|
CREATE TABLE pet.core_fact_lesson_views (
|
|
user_id Int32,
|
|
lesson_id Int32,
|
|
course_id Int32,
|
|
viewed_at DateTime64(3)
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY user_id;
|
|
|
|
-- Таблица enrollments из GP
|
|
|
|
CREATE TABLE pet.core_enrollments (
|
|
id Int32,
|
|
user_id Int32,
|
|
course_id Int32,
|
|
enrolled_at Date
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY user_id;
|
|
|
|
-- Этап 2. Создание витринных таблиц
|
|
-- Задание 2: Подготовь структуру витрины lesson_popularity_summary
|
|
|
|
-- Создаем пустую таблицу lesson_popularity_summary(структуру витрины)
|
|
|
|
CREATE TABLE pet.lesson_popularity_summary
|
|
(
|
|
lesson_id UInt32,
|
|
lesson_title String,
|
|
course_id UInt32,
|
|
course_title String,
|
|
total_views UInt32,
|
|
unique_users UInt32,
|
|
first_view DateTime64(3, 'UTC'),
|
|
last_view DateTime64(3, 'UTC')
|
|
)
|
|
ENGINE = MergeTree
|
|
ORDER BY (lesson_id, course_id);
|
|
|
|
-- Создаем Materialized View
|
|
|
|
CREATE MATERIALIZED VIEW pet.mv_lesson_popularity_summary
|
|
TO pet.lesson_popularity_summary
|
|
AS
|
|
SELECT
|
|
flv.lesson_id AS lesson_id,
|
|
l.title AS lesson_title,
|
|
flv.course_id AS course_id,
|
|
c.title AS course_title,
|
|
count() AS total_views,
|
|
uniqExact(flv.user_id) AS unique_users,
|
|
min(flv.viewed_at) AS first_view,
|
|
max(flv.viewed_at) AS last_view
|
|
FROM pet.core_fact_lesson_views AS flv
|
|
JOIN pet.core_lesson AS l ON flv.lesson_id = l.lesson_id
|
|
JOIN pet.core_course AS c ON flv.course_id = c.course_id
|
|
GROUP BY
|
|
flv.lesson_id,
|
|
l.title,
|
|
flv.course_id,
|
|
c.title;
|
|
|
|
-- Вставляем данные в таблицу pet.lesson_popularity_summary
|
|
|
|
INSERT INTO pet.lesson_popularity_summary
|
|
SELECT
|
|
flv.lesson_id,
|
|
l.title AS lesson_title,
|
|
flv.course_id,
|
|
c.title AS course_title,
|
|
count() AS total_views,
|
|
uniqExact(flv.user_id) AS unique_users,
|
|
min(flv.viewed_at) AS first_view,
|
|
max(flv.viewed_at) AS last_view
|
|
FROM pet.core_fact_lesson_views AS flv
|
|
JOIN pet.core_lesson AS l ON flv.lesson_id = l.lesson_id
|
|
JOIN pet.core_course AS c ON flv.course_id = c.course_id
|
|
GROUP BY
|
|
flv.lesson_id,
|
|
l.title,
|
|
flv.course_id,
|
|
c.title;
|
|
|