diff --git a/mdrozdov/clickhouse/stage1.sql b/mdrozdov/clickhouse/stage1.sql
new file mode 100644
index 0000000..5242dea
--- /dev/null
+++ b/mdrozdov/clickhouse/stage1.sql
@@ -0,0 +1,96 @@
+-- удалить таблицу если раньше создавали
+DROP TABLE IF EXISTS mdrozdov.core_fact_lesson_views
+ON CLUSTER clickhouse_cluster;
+
+-- таблицы измерений
+-- user dimension
+CREATE TABLE mdrozdov.core_dim_user
+ON CLUSTER clickhouse_cluster
+(
+    user_id Int32,
+    name String,
+    age Int32,
+    email String,
+    registration_date Date
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_dim_user',
+    '{replica}'
+)
+ORDER BY user_id;
+
+-- course dimension
+CREATE TABLE mdrozdov.core_dim_course
+ON CLUSTER clickhouse_cluster
+(
+    course_id Int32,
+    title String,
+    category String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_dim_course',
+    '{replica}'
+)
+ORDER BY course_id;
+
+-- lesson dimension
+CREATE TABLE mdrozdov.core_dim_lesson
+ON CLUSTER clickhouse_cluster
+(
+    lesson_id Int32,
+    title String,
+    duration_min Int32,
+    course_id Int32,
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_dim_lesson2',
+    '{replica}'
+)
+ORDER BY (course_id, lesson_id);
+
+-- date dimension
+CREATE TABLE mdrozdov.core_dim_date
+ON CLUSTER clickhouse_cluster
+(
+    date DATE,
+	year Int32,
+	month Int32,
+	day Int32,
+	weekday String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_dim_date',
+    '{replica}'
+)
+ORDER BY date;
+
+
+-- таблицы фактов
+-- core_enrollments
+CREATE TABLE mdrozdov.core_enrollments
+ON CLUSTER clickhouse_cluster
+(
+    user_id Int32,
+    course_id Int32,
+    enrolled_at DateTime64(3)
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_enrollments',
+    '{replica}'
+)
+ORDER BY course_id;
+
+-- core_fact_lesson_views
+CREATE TABLE mdrozdov.core_fact_lesson_views
+ON CLUSTER clickhouse_cluster
+(
+    user_id Int32, 
+    lesson_id Int32,
+    course_id Int32,
+    viewed_at DateTime64(3)
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/core_fact_lesson_views',
+    '{replica}'
+)
+ORDER BY course_id;
diff --git a/mdrozdov/clickhouse/stage2.sql b/mdrozdov/clickhouse/stage2.sql
new file mode 100644
index 0000000..ec43feb
--- /dev/null
+++ b/mdrozdov/clickhouse/stage2.sql
@@ -0,0 +1,152 @@
+--lesson_popularity_summary data mart
+create table mdrozdov.dm_lesson_popularity_summary
+ON CLUSTER clickhouse_cluster(
+    lesson_id               Int32,
+    lesson_title            String,
+    course_id               Int32,
+    course_title            String,
+    total_views             Int32,
+    unique_users            Int32,
+    first_view              DateTime64(3),
+    last_view               DateTime64(3)
+)
+ENGINE = ReplicatedMergeTree(
+	'/clickhouse/tables/{shard}/mdrozdov/dm_lesson_popularity_summary1',
+	'{replica}'
+)
+ORDER BY (lesson_id, course_id);
+
+-- здесь тригер таблица dim_lesson, хотя это не совсем правильно, но мы и состояние не храним
+-- по сути таблица тригер должна быть fact_lesson_views, но right join будет плохо
+-- а если не делать right join, то можем потерять логику, потому что left join от fact_lesson_view
+-- логически теряет данные, если урок не был просмотрен
+-- но оно хотя бы работает
+create materialized view mdrozdov.lesson_popularity_summary 
+on CLUSTER clickhouse_cluster
+to mdrozdov.dm_lesson_popularity_summary as
+select 
+	dl.lesson_id as lesson_id,
+	dl.title as lesson_title,
+	dl.course_id as course_id,
+	dc.title as course_title,
+	count(flv.lesson_id) as total_views,
+	count(distinct flv.user_id) as unique_users,
+	min(flv.viewed_at) as first_view,
+	max(flv.viewed_at) as last_view
+from mdrozdov.core_dim_lesson dl
+left join mdrozdov.core_dim_course dc 
+    on dl.course_id = dc.course_id
+left join mdrozdov.core_fact_lesson_views flv 
+    on dl.lesson_id = flv.lesson_id
+group by dl.lesson_id, dl.title, dl.course_id, dc.title
+
+--inactive_users_summary
+create table mdrozdov.dm_inactive_users_summary
+ON CLUSTER clickhouse_cluster(
+    user_id                         Int32,
+    name                            String,
+    email                           String,
+    age                             Int32,
+    registered_courses_count        Int32,
+    registration_date               Date
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/dm_inactive_users_summary1',
+    '{replica}'
+)
+ORDER BY user_id
+
+-- здесь тригер таблица dim_user
+-- но почему-то при вставке в dim_user новые строки в таргет таблицу не добавляются
+create materialized view mdrozdov.inactive_users_summary
+on CLUSTER clickhouse_cluster
+to mdrozdov.dm_inactive_users_summary
+as
+select
+	du.user_id as user_id,
+	du.name as name,
+	du.email as email,
+	du.age as age,
+	count(e.course_id) as registered_courses_count,
+	du.registration_date as registration_date
+from mdrozdov.core_dim_user du
+left join mdrozdov.core_enrollments e 
+	on du.user_id = e.user_id
+left join mdrozdov.core_fact_lesson_views flv 
+	on du.user_id = flv.user_id
+where flv.user_id is null
+group by du.user_id, du.name, du.email, du.age, du.registration_date
+
+-- course_completion_rate
+create table mdrozdov.dm_course_completion_rate
+ON CLUSTER clickhouse_cluster(
+    user_id                     Int32,
+    user_name                   String,
+    course_id                   Int32,
+    course_title                String,
+    lessons_in_course           Int32,
+    lessons_viewed              Int32,
+    completion_rate             Decimal(4, 3)
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mdrozdov/dm_course_completion_rate',
+    '{replica}'
+)
+ORDER BY (user_id, course_id)
+
+-- здесь тригер таблица core_enrollments и тут все четко по логике и в работе
+create materialized view mdrozdov.course_completion_rate
+on CLUSTER clickhouse_cluster
+to mdrozdov.dm_course_completion_rate as
+with total_lessons_per_course as(
+	select
+		course_id,
+		count(*) as lessons_in_course
+	from mdrozdov.core_dim_lesson
+	group by course_id
+), lessons_viewed as (
+	select 
+		user_id,
+		course_id,
+		count(*) as lessons_viewed
+	from mdrozdov.core_fact_lesson_views flv
+	group by user_id, course_id
+)
+select 
+	du.user_id                      as user_id,
+	du.name                         as user_name,
+	dc.course_id                    as course_id,
+	dc.title                        as course_title,
+	tlpc.lessons_in_course          as lessons_in_course,
+	coalesce(lv.lessons_viewed, 0)  as lessons_viewed,
+	round(
+		coalesce(
+			coalesce(lv.lessons_viewed, 0)*1.0/nullif(tlpc.lessons_in_course, 0), 0
+			), 2) as completion_rate
+from mdrozdov.core_enrollments e
+join mdrozdov.core_dim_user du 
+	on e.user_id = du.user_id
+join total_lessons_per_course tlpc
+	on tlpc.course_id = e.course_id
+join mdrozdov.core_dim_course dc
+	on e.course_id = dc.course_id
+left join lessons_viewed lv
+	on du.user_id = lv.user_id and dc.course_id = lv.course_id
+
+--данные из-за несовпадения названий столбцов в импорте/экспорте пришлось удалять, короче проще вручную
+-- их добавить
+insert into mdrozdov.core_fact_lesson_views(user_id, lesson_id, course_id, viewed_at) values
+(1,	1,	1,	'2023-01-16 10:00:00'),
+(1,	2,	1,	'2023-01-16 10:15:00'),
+(2,	1,	1,	'2023-01-21 09:00:00'),
+(3,	3,	2,	'2023-03-06 12:00:00'),
+(4,	4,	3,	'2023-04-02 10:00:00'),
+(4,	5,	3,	'2023-04-03 10:00:00')
+
+insert into enrollments (user_id, course_id, enrolled_at) values
+(1,	1,	'2023-01-15'),
+(1,	2,	'2023-02-01'),
+(2,	1,	'2023-01-20'),
+(3,	2,	'2023-03-05'),
+(4,	3,	'2023-04-01')
+
diff --git a/mdrozdov/clickhouse/stage3-4.sql b/mdrozdov/clickhouse/stage3-4.sql
new file mode 100644
index 0000000..dc80643
--- /dev/null
+++ b/mdrozdov/clickhouse/stage3-4.sql
@@ -0,0 +1,45 @@
+-- Топ-5 уроков с наименьшим количеством уникальных пользователей
+SELECT 
+    lesson_title,
+    course_title,
+    unique_users
+FROM lesson_popularity_summary
+ORDER BY unique_users ASC
+LIMIT 5;
+
+-- Пользователи без зарегистрированных курсов
+SELECT 
+    name,
+    email,
+    registration_date
+FROM inactive_users_summary
+WHERE registered_courses_count = 0
+ORDER BY registration_date ASC;
+
+-- Список курсов с минимальной средней степенью завершения
+SELECT 
+    course_title,
+    AVG(completion_rate) AS avg_completion
+FROM course_completion_rate
+GROUP BY course_title
+ORDER BY avg_completion ASC
+LIMIT 5;
+
+-- Мини отчет:
+/*
+Таблица lesson_popularity_summary
+    Выбранные поля для проверки:
+        total_views - агрегат count
+        first_view - агрегат min
+    оба совпадают
+Таблица inactive_users_summary
+    Выбранные поля для проверки:
+        registered_courses_count - агрегат count
+    совпадает
+Таблица course_completion_rate
+    Выбранные поля для проверки:
+        completion_rate - агрегат count
+    совпадает
+Итог: в моем случае все значения совпали, возможно если бы это было не через простой MergeTree
+все было бы хуже
+*/
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