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;
+