From 717f705fadd10dd2e31dca652e37cc01cb24f8d4 Mon Sep 17 00:00:00 2001
From: George <theboure@gmail.com>
Date: Thu, 11 Dec 2025 18:30:49 +0300
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---
 gmokrousov/postgresql/DM_platform_summary.sql | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 gmokrousov/postgresql/DM_platform_summary.sql

diff --git a/gmokrousov/postgresql/DM_platform_summary.sql b/gmokrousov/postgresql/DM_platform_summary.sql
new file mode 100644
index 0000000..3ff7377
--- /dev/null
+++ b/gmokrousov/postgresql/DM_platform_summary.sql
@@ -0,0 +1,24 @@
+create materialized view platform_summary as 
+	with 
+        lv_stats as (
+            select 
+                count(distinct user_id) as users_with_views,
+                count(*)::decimal / count(distinct lesson_id) as avg_views_per_lesson
+            from lesson_views
+    	)
+	select 
+		total_users,
+		total_courses,
+		total_lessons,
+		users_with_views,
+		round((total_lessons::decimal / total_courses), 2) AS avg_lessons_per_course,
+		round(avg_views_per_lesson, 2) as avg_views_per_lesson
+	from 
+		(
+		select 
+			(select count(*) from users) as total_users,
+			(select count(*) from courses) as total_courses,
+			count(*) as total_lessons
+		from lessons
+	) as s
+	cross join lv_stats as lv;
\ No newline at end of file