Исправился по всем замечаниям

bhabibullin/greenplum/pet_project_gp.sql

@@ -119,16 +119,14 @@ SELECT
     dl.title AS lesson_title,
     dc.course_id,
     dc.title AS course_title,
-    COUNT(flv.lesson_id) AS total_views,
-    COUNT(DISTINCT du.user_id) AS unique_users,
+    COUNT(*) AS total_views,
+    COUNT(DISTINCT flv.user_id) AS unique_users,
     MIN(flv.viewed_at) AS first_view,
     MAX(flv.viewed_at) AS last_view
 FROM core.dim_lesson dl
 JOIN core.dim_course dc ON dc.course_id = dl.course_id
 JOIN core.fact_lesson_views flv ON flv.lesson_id = dl.lesson_id
-JOIN core.dim_user du ON du.user_id = flv.user_id
-GROUP BY dl.lesson_id, dl.title, dc.course_id, dc.title
-ORDER BY dl.lesson_id;
+GROUP BY dl.lesson_id, dl.title, dc.course_id, dc.title;
 
 
 /*
@@ -155,12 +153,15 @@ SELECT
     du.name AS user_name,
     du.email,
     du.age,
-    COUNT(e.course_id) AS enrollments_count,
+    COUNT(DISTINCT e.course_id) AS enrollments_count,
     du.registration_date
 FROM core.dim_user du
 LEFT JOIN core.enrollments e ON e.user_id = du.user_id
-LEFT JOIN core.fact_lesson_views flv ON flv.user_id = du.user_id
-WHERE flv.user_id IS NULL
+WHERE NOT EXISTS (
+    SELECT 1 
+    FROM core.fact_lesson_views flv 
+    WHERE flv.user_id = du.user_id
+)
 GROUP BY du.user_id, du.name, du.email, du.age, du.registration_date;
 
 /*