Clickhouse - Типы таблиц - Домашки

2026-02-12 20:35:06 +04:00
parent 93b3777a42
commit d7f84de43f
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 --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;