add pet-project

2026-05-27 13:45:45 +03:00
parent e0b74cdc13
commit 1af6c81db1
8 changed files with 602 additions and 0 deletions
@@ -0,0 +1,105 @@
+DROP MATERIALIZED VIEW IF EXISTS dmezentsev.conversion_funnel;
+CREATE MATERIALIZED VIEW dmezentsev.conversion_funnel AS 
+WITH progress AS (
+	-- Прогресс каждого пользователя по каждому курсу
+	SELECT 
+		e.course_id,
+		e.user_id,
+		COUNT(DISTINCT l.id) AS total_lessons,
+		COUNT(DISTINCT lv.lesson_id) AS viewed_lessons,
+		ROUND(COUNT(DISTINCT lv.lesson_id) * 100.0 / NULLIF(COUNT(DISTINCT l.id), 0), 2) AS viewed_pct
+	FROM dmezentsev.enrollments e
+	LEFT JOIN dmezentsev.lessons l ON e.course_id = l.course_id
+	LEFT JOIN dmezentsev.lesson_views lv ON l.id = lv.lesson_id AND e.user_id = lv.user_id
+	GROUP BY e.course_id, e.user_id
+),
+
+funnel_stats AS (
+	-- Статистика по каждому курсу для всех этапов воронки
+	SELECT 
+		c.id AS course_id,
+		c.title AS course_title,
+		(SELECT COUNT(*) FROM dmezentsev.users_) AS registered_count,
+		COUNT(DISTINCT e.user_id) AS enrolled_count,
+		COUNT(DISTINCT CASE WHEN p.viewed_lessons > 0 THEN e.user_id END) AS started_count,
+		COUNT(DISTINCT CASE WHEN p.viewed_pct >= 50 THEN e.user_id END) AS mid_progress_count,
+		COUNT(DISTINCT CASE WHEN p.viewed_pct = 100 THEN e.user_id END) AS completed_count
+	FROM dmezentsev.courses c
+	LEFT JOIN dmezentsev.enrollments e ON c.id = e.course_id
+	LEFT JOIN progress p ON e.course_id = p.course_id AND e.user_id = p.user_id
+	GROUP BY c.id, c.title
+)
+
+-- Соединяем этапы с помощью UNION ALL 
+SELECT 
+	course_id,
+	course_title,
+	stage_name,
+	users_count,
+	conversion_from_previous,
+	conversion_from_start
+FROM (
+	-- Этап 1: registered
+	SELECT 
+		course_id,
+		course_title,
+		'registered' AS stage_name,
+		registered_count AS users_count,
+		0 AS conversion_from_previous,
+		100.00 AS conversion_from_start,
+		1 AS stage_order
+	FROM funnel_stats
+
+	UNION ALL
+
+	-- Этап 2: enrolled
+	SELECT 
+		course_id,
+		course_title,
+		'enrolled',
+		enrolled_count,
+		ROUND(100.0 * enrolled_count / NULLIF(registered_count, 0), 2),
+		ROUND(100.0 * enrolled_count / NULLIF(registered_count, 0), 2),
+		2 AS stage_order
+	FROM funnel_stats
+
+	UNION ALL
+
+	-- Этап 3: started
+	SELECT 
+		course_id,
+		course_title,
+		'started',
+		started_count,
+		ROUND(100.0 * started_count / NULLIF(enrolled_count, 0), 2),
+		ROUND(100.0 * started_count / NULLIF(registered_count, 0), 2),
+		3 AS stage_order
+	FROM funnel_stats
+
+	UNION ALL
+
+	-- Этап 4: mid_progress
+	SELECT 
+		course_id,
+		course_title,
+		'mid_progress',
+		mid_progress_count,
+		ROUND(100.0 * mid_progress_count / NULLIF(started_count, 0), 2),
+		ROUND(100.0 * mid_progress_count / NULLIF(registered_count, 0), 2),
+		4 AS stage_order
+	FROM funnel_stats
+
+	UNION ALL
+
+	-- Этап 5: completed
+	SELECT 
+		course_id,
+		course_title,
+		'completed',
+		completed_count,
+		ROUND(100.0 * completed_count / NULLIF(mid_progress_count, 0), 2),
+		ROUND(100.0 * completed_count / NULLIF(registered_count, 0), 2),
+		5 AS stage_order
+	FROM funnel_stats
+) AS funnel_rows
+ORDER BY course_id, stage_order;