diff --git a/mdrozdov/postgresql/dm_course_summary.sql b/mdrozdov/postgresql/dm_course_summary.sql
new file mode 100644
index 0000000..17a84a4
--- /dev/null
+++ b/mdrozdov/postgresql/dm_course_summary.sql
@@ -0,0 +1,16 @@
+create materialized view dm_course_summary as
+select
+	e.course_id,
+	c.title,
+	count(distinct e.user_id) as unique_users,
+	count(distinct l.id) as lessons_count,
+	count(distinct lv.id) as total_views,
+	count(distinct lv.id)*1.0/count(distinct e.user_id) as avg_views_per_user,
+	min(lv.viewed_at) as first_viewed_at,
+	max(lv.viewed_at) as last_viewed_at
+from enrollments e
+join courses c on e.course_id = c.id
+join lessons l on  c.id = l.course_id
+join lessons_views lv on lv.lesson_id = l.id
+group by e.course_id, c.title
+order by e.course_id