Работа над ошибками: 'Синтаксис'.

Практика: 'JOIN' - 'Массивы, Map и вложенные структуры*' - 'Партиции' - 'Индексы'.
2026-05-18 16:55:22 +03:00
parent 80d333fe52
commit ae208a76fb
8 changed files with 577 additions and 0 deletions
@@ -0,0 +1,120 @@
+-- Задание 1
+
+CREATE TABLE mnoskov.page_views 
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	url String,
+	view_time DateTime
+)
+ENGINE = MergeTree
+PARTITION BY toYYYYMM(view_time)
+ORDER BY (user_id, view_time);
+
+
+-- Задание 2
+CREATE TABLE mnoskov.users
+ON CLUSTER clickhouse_cluster
+(
+	id UInt64,
+	name String,
+	update_at DateTime
+)
+ENGINE = ReplacingMergeTree(update_at)
+ORDER BY id;
+
+
+-- Задание 3
+CREATE TABLE mnoskov.region_sales
+ON CLUSTER clickhouse_cluster
+(
+	region String,
+	date Date,
+	sales UInt64
+)
+ENGINE = SummingMergeTree
+PARTITION BY toYYYYMM(date)
+ORDER BY (region, date);
+
+INSERT INTO mnoskov.region_sales (region, date, sales)
+VALUES
+    ('Moscow',   '2026-05-01', 100),
+    ('Moscow',   '2026-05-01', 150),
+    ('Moscow',   '2026-05-01', 200),
+    ('Berlin',   '2026-05-02', 300),
+    ('Berlin',   '2026-05-02', 120),
+    ('Berlin',   '2026-05-02', 80),
+    ('Paris',    '2026-05-03', 500),
+    ('Paris',    '2026-05-03', 250),
+    ('London',   '2026-05-04', 400),
+    ('Tokyo',    '2026-05-05', 700);
+
+SELECT * FROM mnoskov.region_sales;
+-- Все четко работает.
+
+
+-- Задание 4
+CREATE TABLE mnoskov.user_metrics
+ON CLUSTER clickhouse_cluster
+(
+	region String,
+	avg_age_state AggregateFunction(avg, UInt8),
+	active_users_state AggregateFunction(uniq, UInt64)
+)
+ENGINE = AggregatingMergeTree
+ORDER BY region;
+
+CREATE TABLE mnoskov.user_metrics_source
+ON CLUSTER clickhouse_cluster
+(
+	region String,
+	age UInt8,
+	user_id UInt64
+)
+ENGINE = MergeTree
+ORDER BY region;
+
+INSERT INTO mnoskov.user_metrics_source
+(region, age, user_id)
+VALUES
+    ('Moscow', 25, 1001),
+    ('Moscow', 30, 1002),
+    ('Moscow', 22, 1003),
+    ('Moscow', 25, 1001),
+    ('Berlin', 40, 2001),
+    ('Berlin', 35, 2002),
+    ('Berlin', 29, 2003),
+    ('Berlin', 35, 2002),
+    ('Paris', 31, 3001),
+    ('Paris', 28, 3002),
+    ('Paris', 45, 3003),
+    ('Paris', 31, 3001),
+    ('London', 50, 4001),
+    ('London', 41, 4002),
+    ('London', 38, 4003),
+    ('London', 41, 4002),
+    ('Tokyo', 27, 5001),
+    ('Tokyo', 33, 5002),
+    ('Tokyo', 29, 5003),
+    ('Tokyo', 33, 5002);
+SELECT * FROM mnoskov.user_metrics_source;
+
+INSERT INTO mnoskov.user_metrics
+SELECT
+	region,
+	avgState(age) AS avg_age_state,
+	uniqState(user_id) AS active_users_state
+FROM
+	mnoskov.user_metrics_source
+GROUP BY
+	region;
+
+SELECT
+	region,
+	avgMerge(avg_age_state),
+	uniqMerge(active_users_state)
+FROM
+	mnoskov.user_metrics
+GROUP BY
+	region;
+-- Че то кликхаус странно себя ведет, то таблицы сами очищаются, то удаленные таблицы воскресают.