fix course_summary and user_activity files

skonev/postgresql/dm_user_activity_summary.sql

@@ -5,7 +5,7 @@ WITH users_views AS (
 SELECT
 	u.id AS user_id,
 	u.name, 
-	COUNT(DISTINCT lv.lesson_id) AS viewed_lessons_COUNT,
+	COUNT(DISTINCT lv.lesson_id) AS viewed_lessons_count,
 	MAX(lv.viewed_at) AS last_view,
 	MIN(lv.viewed_at) AS first_view
 FROM users AS u
@@ -16,7 +16,7 @@ GROUP BY u.id
 users_engagement AS (
 SELECT 
 	e.user_id AS user_id,
-	COUNT(l.id) AS lessons_cnt,
+	COUNT(DISTINCT l.id) AS lessons_cnt,
 	COUNT(DISTINCT course_id) AS enrollment_count
 FROM enrollments AS e
 JOIN lessons AS l using(course_id)
@@ -28,7 +28,7 @@ SELECT
 	uv.name,
 	ue.enrollment_count,
 	uv.viewed_lessons_count,
-	uv.lASt_view,
+	uv.last_view,
 	uv.first_view,
 	ROUND(uv.viewed_lessons_count::DECIMAL / NULLIF(ue.lessons_cnt, 0) * 100, 2)  AS engagement_rate
 FROM users_views AS uv