fixed reltive last comments

skonev/greenplum/STEP4.1_dm.lesson_popularity_summary.sql

@@ -6,11 +6,12 @@
 
 CREATE MATERIALIZED VIEW IF NOT EXISTS dm.lesson_popularity_summary AS
 -- EXPLAIN ANALYZE
+DISTRIBUTED BY (lesson_id, course_id)
 WITH t1 AS (
 SELECT 
 	lesson_id,
 	course_id,
-	COUNT(lesson_id) AS total_views,
+	COUNT(*) AS total_views,
 	COUNT(DISTINCT user_id) AS unique_users,
 	MIN(viewed_at)AS first_view,
 	MAX(viewed_at)AS last_view
@@ -25,8 +26,8 @@ SELECT
 	c.title AS course_title
 FROM core.dim_course c 
 LEFT JOIN core.dim_lesson l USING(course_id)
-
 )
+
 SELECT 
 	t1.lesson_id,
 	t2.lesson_title,
@@ -37,6 +38,5 @@ SELECT
 	t1.first_view,
 	t1.last_view
 FROM t1
-LEFT JOIN t2 USING(lesson_id)
+LEFT JOIN t2 USING(lesson_id, course_id);
 
-DISTRIBUTED BY (lesson_id, course_id);

skonev/greenplum/STEP4.2_dm.inactive_users_summary.sql

@@ -7,6 +7,7 @@
 
 CREATE MATERIALIZED VIEW IF NOT EXISTS dm.inactive_users_summary AS
 -- EXPLAIN ANALYZE
+DISTRIBUTED BY (user_id)
 WITH t1 AS (
 SELECT 
 	user_id,
@@ -19,10 +20,9 @@ SELECT
 	u.name AS user_name,
 	u.email,
 	u.age,
-	coalesce(t1.enrollments_count, 0),
+	coalesce(t1.enrollments_count, 0) AS enrollments_count,
 	u.registration_date
 FROM core.dim_user u
 LEFT JOIN t1  USING (user_id)
-WHERE u.user_id NOT IN (SELECT user_id FROM core.fact_lesson_views)
+WHERE u.user_id NOT EXISTS (SELECT user_id FROM core.fact_lesson_views);
 
-DISTRIBUTED BY (user_id);