added three data_mart_files

2025-12-17 14:28:42 +03:00
parent 53398bc3ad
commit 18f736dea4
3 changed files with 97 additions and 0 deletions
@@ -0,0 +1,20 @@
+BEGIN;
+
+CREATE MATERIALIZED VIEW platform_summary AS 
+SELECT
+    (SELECT COUNT(*) FROM users) AS total_users,
+    (SELECT COUNT(*) FROM courses) AS total_courses,
+    (SELECT COUNT(*) FROM lessons) AS total_lessons,
+    (SELECT COUNT(DISTINCT user_id) FROM lesson_views) AS users_with_views,
+    ROUND(
+        (SELECT COUNT(*)::DECIMAL FROM lessons) / 
+        NULLIF((SELECT COUNT(DISTINCT course_id) FROM lessons), 0), 
+        2
+    ) AS avg_lessons_per_course,
+    ROUND(
+        (SELECT COUNT(*)::DECIMAL FROM lesson_views) / 
+        NULLIF((SELECT COUNT(DISTINCT lesson_id) FROM lesson_views), 0), 
+        2
+    ) AS avg_views_per_lesson;
+
+COMMIT;