--Задача 1: Создай таблицу page_views

CREATE TABLE page_views (
 user_id  UInt64,
 url  String,
 view_time  DateTime
 )
ENGINE = MergeTree()
PARTITION BY toYYYYMM(view_time)
ORDER BY (user_id, view_time);

--Задача 2: Создай таблицу users

CREATE TABLE users (
id UInt64,
name String,
updated_at DateTime
 )
ENGINE = ReplacingMergeTree(updated_at)
ORDER BY id;

-- Задача 3: Создай таблицу region_sales

CREATE TABLE region_sales (
region String,
date Date,
sales UInt64
 )
ENGINE = SummingMergeTree()
PARTITION BY toYYYYMM(date)
ORDER BY (region, date);

--Задача 4.1: Создай таблицу user_metrics

CREATE TABLE user_metrics (
region String,
avg_age_state AggregateFunction(avg, UInt8),
active_users_state AggregateFunction(uniq, UInt64)
 )
ENGINE = AggregatingMergeTree()
ORDER BY region;

--Задача 4.3: - Вставь данные и Читай их через `avgMerge()` и `uniqMerge()`

INSERT INTO user_metrics
SELECT
    region,
    avgState(age) AS avg_age_state,
    uniqState(toUInt64(user_id)) AS active_users_state
FROM
(
    SELECT 'Samara' AS region, 25 AS age, 1 AS user_id
    UNION ALL
    SELECT 'Moscow', 30, 2
    UNION ALL
    SELECT 'Moscow', 22, 3
    UNION ALL
    SELECT 'Samara', 22, 4
    UNION ALL
    SELECT 'Sochi', 34, 5
)
GROUP BY region;

--Задача 4.4: - Читай их через `avgMerge()` и `uniqMerge()`

SELECT
    region,
    avgMerge(avg_age_state),
    uniqMerge(active_users_state)
FROM user_metrics
GROUP BY region;