diff --git a/HomeWork_Lesson-10.sql b/HomeWork_Lesson-10.sql
new file mode 100644
index 0000000..90d2e51
--- /dev/null
+++ b/HomeWork_Lesson-10.sql
@@ -0,0 +1,103 @@
+-- Провести аналитику в разрезе групп.
+
+-- Построить запрос, который будет выводить следующие столбцы:
+
+-- имя группы
+-- среднее количество пользователей в группах
+-- самый молодой пользователь в группе
+-- самый пожилой пользователь в группе
+-- количество пользователей в группе
+-- всего пользователей в системе
+-- отношение в процентах (количество пользователей в группе / всего пользователей в системе) * 100
+
+SELECT DISTINCT 
+  communities.name AS group_name,
+  COUNT(communities_users.user_id) OVER() 
+    / (SELECT COUNT(*) FROM communities) AS avg_users_in_groups,
+  FIRST_VALUE(users.id) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday DESC) AS youngest,
+  FIRST_VALUE(users.id) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday) AS oldest,
+  COUNT(communities_users.user_id) 
+    OVER(PARTITION BY communities.id) AS users_in_groups,
+  COUNT(users.id) OVER() AS users_total,
+  COUNT(communities_users.user_id) OVER(PARTITION BY communities.id) 
+    / COUNT(users.id) OVER() *100 AS '%%'
+    FROM communities
+      JOIN communities_users 
+        ON communities_users.community_id = communities.id
+      JOIN users 
+        ON communities_users.user_id = users.id
+      JOIN profiles 
+        ON profiles.user_id = users.id;
+       
+SELECT DISTINCT 
+  communities.name AS group_name,
+  COUNT(communities_users.user_id) OVER() 
+    / (SELECT COUNT(*) FROM communities) AS avg_users_in_groups,
+  FIRST_VALUE(users.first_name) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday DESC) AS youngest_first_name,
+  FIRST_VALUE(users.last_name) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday DESC) AS youngest_last_name,
+  FIRST_VALUE(users.first_name) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday) AS oldest_first_name,
+  FIRST_VALUE(users.last_name) 
+    OVER(PARTITION BY communities.id ORDER BY profiles.birthday) AS oldest_last_name,
+  COUNT(communities_users.user_id) 
+    OVER(PARTITION BY communities.id) AS users_in_groups,
+  COUNT(users.id) OVER() AS users_total,
+  COUNT(communities_users.user_id) OVER(PARTITION BY communities.id) 
+    / COUNT(users.id) OVER() *100 AS '%%'
+    FROM communities
+      JOIN communities_users 
+        ON communities_users.community_id = communities.id
+      JOIN users 
+        ON communities_users.user_id = users.id
+      JOIN profiles 
+        ON profiles.user_id = users.id;        
+
+SELECT DISTINCT 
+  communities.name AS group_name,
+  COUNT(communities_users.user_id) OVER() 
+    / (SELECT COUNT(*) FROM communities) AS avg_users_in_groups,
+  FIRST_VALUE(users.first_name) 
+    OVER birthday_desc AS youngest_first_name,
+  FIRST_VALUE(users.last_name) 
+    OVER birthday_desc AS youngest_last_name,
+  FIRST_VALUE(users.first_name) 
+    OVER birthday_asc AS oldest_first_name,
+  FIRST_VALUE(users.last_name) 
+    OVER birthday_asc AS oldest_last_name,
+  COUNT(communities_users.user_id) 
+    OVER(PARTITION BY communities.id) AS users_in_groups,
+  COUNT(users.id) OVER() AS users_total,
+  COUNT(communities_users.user_id) OVER(PARTITION BY communities.id) 
+    / COUNT(users.id) OVER() *100 AS '%%'
+    FROM communities
+      JOIN communities_users 
+        ON communities_users.community_id = communities.id
+      JOIN users 
+        ON communities_users.user_id = users.id
+      JOIN profiles 
+        ON profiles.user_id = users.id
+      WINDOW birthday_desc AS (PARTITION BY communities.id ORDER BY profiles.birthday DESC),
+             birthday_asc AS (PARTITION BY communities.id ORDER BY profiles.birthday);
+            
+      
+SELECT 
+  ROW_NUMBER() OVER w AS 'row_number',
+  from_user_id, 
+  created_at, 
+  LEAD(created_at)  OVER w AS 'LEAD',
+  LAG(created_at)  OVER w AS 'LAG'
+    FROM messages
+      WINDOW w AS (PARTITION BY (from_user_id) ORDER BY created_at); 
+      
+SELECT 
+  ROW_NUMBER() OVER w AS 'row_number',
+  from_user_id, 
+  created_at, 
+  LAG(created_at)  OVER w AS 'LAG',
+  TIMESTAMPDIFF(SECOND, LAG(created_at)  OVER w, created_at) AS difference
+    FROM messages
+      WINDOW w AS (PARTITION BY (from_user_id) ORDER BY created_at);