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fix mistakes in 11.5 lesson popularity rank

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Dmitry Medvedev
2026-06-29 01:40:06 +05:00
parent 782f305acd
commit eeca2c2209
1 changed files with 3 additions and 3 deletions
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dmedvedev/11.5 Pet project Lesson_popularity_ranking.sql
+3 -3
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@@ -9,10 +9,11 @@ SELECT
table_unique_viewers.unique_v AS unique_viewers, table_unique_viewers.unique_v AS unique_viewers,
ROUND(AVG(views_one_user_per_one_lesson.views_per_viewer), 2) AS avg_views_per_viewer, --также это можно было посчитать total_views/unique_viewers ROUND(AVG(views_one_user_per_one_lesson.views_per_viewer), 2) AS avg_views_per_viewer, --также это можно было посчитать total_views/unique_viewers
DENSE_RANK() OVER ( DENSE_RANK() OVER (
PARTITION BY pc.id
ORDER BY total_views_lesson.total_views DESC NULLS LAST ORDER BY total_views_lesson.total_views DESC NULLS LAST
) AS popularity_rank, ) AS popularity_rank,
ROUND(table_unique_viewers.unique_v * 100.0 / table_enrolled_users.enrolled_to_course, 2) || '%' AS completion_rate ROUND(COALESCE(table_unique_viewers.unique_v, 0) * 100.0 / NULLIF(table_enrolled_users.enrolled_to_course, 0), 2) || '%' AS completion_rate
FROM pet_lessons pl FROM pet_lessons pl
@@ -60,5 +61,4 @@ SELECT
GROUP BY pl.id, pl.title, pc.id, pc.title, total_views_lesson.total_views, table_unique_viewers.unique_v, table_enrolled_users.enrolled_to_course GROUP BY pl.id, pl.title, pc.id, pc.title, total_views_lesson.total_views, table_unique_viewers.unique_v, table_enrolled_users.enrolled_to_course
ORDER BY lesson_id; ORDER BY popularity_rank;