From 8c6daac203ecdde1ad934919d6a763f36e85e6a9 Mon Sep 17 00:00:00 2001
From: Bonifatsiy <bonifatsiy2799@yandex.ru>
Date: Mon, 20 Apr 2026 03:32:36 +0400
Subject: [PATCH] =?UTF-8?q?=D0=97=D0=B0=D0=BF=D1=80=D0=BE=D1=81=D1=8B=20-?=
 =?UTF-8?q?=20=D0=A1=D0=B8=D0=BD=D1=82=D0=B0=D0=BA=D1=81=D0=B8=D1=81=20(Ta?=
 =?UTF-8?q?sk=201=20and=202)=20v2?=
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---
 .../Homework/Запросы - Синтаксис.sql          | 32 +++++++++++++++----
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/dsolovianov/clickhouse/Homework/Запросы - Синтаксис.sql b/dsolovianov/clickhouse/Homework/Запросы - Синтаксис.sql
index 47d7629..abd02d7 100644
--- a/dsolovianov/clickhouse/Homework/Запросы - Синтаксис.sql	
+++ b/dsolovianov/clickhouse/Homework/Запросы - Синтаксис.sql	
@@ -2,7 +2,7 @@
 
 --! Задача 1 !--
 
-DROP TABLE IF EXISTS users ON CLUSTER clickhouse_cluster;
+DROP TABLE IF EXISTS dsolovianov.users ON CLUSTER clickhouse_cluster SYNC;
 
 CREATE TABLE users 
 ON CLUSTER clickhouse_cluster 
@@ -11,8 +11,11 @@ ON CLUSTER clickhouse_cluster
     name String,
     age UInt8,
     country String,
-    is_active UInt8
-) ENGINE = MergeTree()
+    is_active Boolean
+) ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/dsolovianov/users_v2',
+    '{replica}'
+)
 ORDER BY user_id;
 
 INSERT INTO users VALUES
@@ -73,6 +76,12 @@ SELECT
 FROM users
 GROUP BY country;
 
+SELECT 
+    country,
+    uniqExact(country) as unique_countries --возвращает точное количество уникальных значений в столбце country
+FROM users
+GROUP BY country;
+
 --Для каждой страны выведи минимальный и максимальный возраст.
 SELECT 
     country,
@@ -90,6 +99,18 @@ FROM users
 GROUP BY country
 ORDER BY user_country DESC;
 
+--Всё вместе
+SELECT 
+    country,
+    COUNT(*) as user_country,
+    SUM(is_active) as active_users,
+    MIN(age) as min_age,
+    MAX(age) as max_age,
+    uniqExact(country) as unique_countries
+FROM users
+GROUP BY country
+ORDER BY country;
+
 --! Задача 2 !--
 
 DROP TABLE IF EXISTS dsolovianov.events ON CLUSTER clickhouse_cluster SYNC;
@@ -104,7 +125,7 @@ ENGINE = ReplicatedMergeTree(
     '/clickhouse/tables/{shard}/dsolovianov/events_v2',
     '{replica}'
 )
-ORDER BY user_id;
+ORDER BY (user_id, event_time);
 
 INSERT INTO dsolovianov.events (user_id, event_time, event_type) VALUES
 (1, '2025-07-17 09:00:00', 'click'),
@@ -220,5 +241,4 @@ ORDER BY re.user_id, re.event_time;
 Вопрос: поддерживает ли ClickHouse многоуровневые или рекурсивные CTE?
 многоуровневые CTE - да
 рекурсивные CTE - нет в классическом понимании, а скорее в итеративном смысле.
-*/
-
+*/
\ No newline at end of file