Практика 'Синтаксис' - Clickhouse
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mnoskov
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-- Задание 1
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CREATE TABLE mnoskov.users
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ON CLUSTER clickhouse_cluster
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(
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user_id UInt32,
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name String,
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age UInt8,
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country String,
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is_active UInt8
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)
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ENGINE = ReplicatedMergeTree(
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'/clickhouse/tables/{shard}/mnoskov/users',
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'{replica}'
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)
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ORDER BY user_id;
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INSERT INTO mnoskov.users
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(user_id,name,age,country,is_active)
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VALUES
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(1,'Ivan',30,'RU',1),
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(2,'Anna',25,'RU',1),
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(3,'Petr',45,'RU',0),
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(4,'Olga',35,'RU',1),
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(5,'John',55,'US',1),
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(6,'Alice',42,'US',0),
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(7,'Tom',38,'US',1),
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(8,'Lucas',28,'BR',1),
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(9,'Maria',60,'BR',1),
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(10,'Joao',27,'BR',0),
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(11,'Kenji',33,'JP',1),
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(12,'Yuki',29,'JP',0),
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(13,'Chen',40,'CN',1),
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(14,'Li',48,'CN',1),
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(15,'Fatima',31,'AE',1),
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(16,'Ahmed',36,'AE',1),
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(17,'George',24,'US',1),
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(18,'Nina',34,'RU',1),
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(19,'Max',50,'DE',1),
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(20,'Sophie',22,'DE',0);
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SELECT * FROM mnoskov.users;
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--1
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SELECT
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user_id,
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age,
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is_active
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FROM
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mnoskov.users
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WHERE
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is_active = TRUE
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ORDER BY
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age DESC
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LIMIT 10;
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--2
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SELECT
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name,
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country
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FROM
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mnoskov.users
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WHERE
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country = 'RU'
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ORDER BY
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name;
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--3
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SELECT
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user_id,
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age,
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is_active
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FROM
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mnoskov.users
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WHERE
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is_active = TRUE
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LIMIT 10;
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-- Данные вывелить так как лежат на диске.
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--4
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SELECT
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country,
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count()
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FROM
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mnoskov.users
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GROUP BY
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country;
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--5
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SELECT
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country,
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min(age) AS min_age,
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max(age) AS max_age
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FROM
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mnoskov.users
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GROUP BY
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country;
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--6
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SELECT
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country,
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count() AS cnt_users
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FROM
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mnoskov.users
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GROUP BY
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country
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ORDER BY
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cnt_users DESC;
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--Доп
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SELECT
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uniqExact(country),
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uniq(country)
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FROM
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mnoskov.users;
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-- uniqExact(country) - кол-во уникальных значений в колонке country. Но uniq работает также.
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-- В инете написано что uniq быстрее.
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-- Задание 2
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CREATE TABLE mnoskov.events1
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ON CLUSTER clickhouse_cluster
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(
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user_id UInt32,
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event_time DateTime,
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event_type String
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)
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ENGINE = ReplicatedMergeTree(
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'/clickhouse/tables/{shard}/mnoskov/events1',
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'{replica}'
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)
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ORDER BY(user_id,event_time);
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INSERT INTO mnoskov.events1
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(user_id,event_time,event_type)
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VALUES
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(1,'2025-07-17 09:00:00','click'),
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(1,'2025-07-17 09:05:00','view'),
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(1,'2025-07-17 09:10:00','purchase'),
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(2,'2025-07-17 10:00:00','click'),
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(2,'2025-07-17 10:05:00','click'),
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(2,'2025-07-17 11:00:00','view'),
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(3,'2025-07-16 12:00:00','view'),
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(3,'2025-07-16 12:30:00','click'),
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(3,'2025-07-17 08:00:00','purchase'),
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(4,'2025-07-17 13:00:00','click'),
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(4,'2025-07-17 14:00:00','view'),
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(4,'2025-07-17 15:00:00','view'),
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(5,'2025-07-16 20:00:00','view'),
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(5,'2025-07-17 01:00:00','click'),
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(5,'2025-07-17 06:00:00','purchase'),
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(6,'2025-07-17 07:30:00','view'),
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(6,'2025-07-17 08:45:00','click'),
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(7,'2025-07-16 23:59:59','click'),
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(7,'2025-07-17 00:01:00','purchase'),
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(7,'2025-07-17 10:10:00','view');
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SELECT * FROM mnoskov.events1;
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--1
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SELECT
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user_id,
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event_time,
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event_type,
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count() OVER(PARTITION BY user_id ORDER BY event_time) AS com_users
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FROM
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mnoskov.events1;
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--2
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SELECT
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user_id,
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event_time,
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event_type,
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row_number() OVER (PARTITION BY user_id ORDER BY event_time) rn,
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dense_rank() OVER (PARTITION BY user_id ORDER BY event_time) dr,
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count() OVER(PARTITION BY user_id ORDER BY event_time) AS c,
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sum(1) OVER(PARTITION BY user_id ORDER BY event_time) AS s
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FROM
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mnoskov.events1;
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--3
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SELECT
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user_id,
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event_time,
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event_type,
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count() OVER(PARTITION BY user_id ORDER BY event_time ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS com_users,
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count() OVER(PARTITION BY user_id ORDER BY event_time ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS com_users2
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FROM
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mnoskov.events1;
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-- все четенько работает, никаких ошибкок нет
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--4-5-6
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WITH recent_events AS (
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SELECT
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user_id,
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event_time,
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event_type
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FROM
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mnoskov.events1
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WHERE
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event_time < now() - INTERVAL 1 DAY
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)
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SELECT
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user_id,
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count(*) AS cnt_user_actions
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FROM
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recent_events
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GROUP BY
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user_id
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ORDER BY
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cnt_user_actions DESC
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LIMIT
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5;
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-- не понял, как сделать 6 пункт.
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-- Ответ на вопрос - ну да - поддерживает.
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