Пет-проект Greenplum (полностью)

2026-01-23 00:12:06 +04:00
parent ac9a2e0906
commit 93b3777a42
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+--Витрина dm.lesson_popularity_summary
+CREATE MATERIALIZED VIEW dm.lesson_popularity_summary as
+select 
+	l.lesson_id,
+	l.title as lesson_title,
+	c.course_id,
+	c.title as course_title,
+	COUNT(f.user_id) as total_views,
+	COUNT(DISTINCT f.user_id) as unique_users,
+	MIN(f.viewed_at) as first_view,
+	MAX(f.viewed_at) as last_view
+FROM core.fact_lesson_views f
+JOIN core.dim_lesson l
+    ON f.lesson_id = l.lesson_id
+JOIN core.dim_course c
+    ON l.course_id = c.course_id
+GROUP BY
+    l.lesson_id,
+    l.title,
+    c.course_id,
+    c.title
+order by lesson_id;
+
+select * from dm.lesson_popularity_summary;
+
+--Удалил лишний индекс
+DROP INDEX core.idx_fact_views_course_id;
+
+-- Все индексы для  CORE-таблиц
+SELECT 
+    tablename,
+    indexname,
+    indexdef
+FROM pg_indexes 
+WHERE schemaname = 'core'
+  AND tablename IN (
+      'dim_course',
+      'dim_date', 
+      'dim_lesson',
+      'dim_user',
+      'enrollments',
+      'fact_lesson_views'
+  )
+ORDER by indexname, tablename;
+
+
+--Витрина dm.inactive_users_summary
+CREATE MATERIALIZED VIEW dm.inactive_users_summary as
+select
+	du.user_id,
+	du.name as user_name,
+	du.email,
+	du.age,
+	COUNT(e.course_id) as enrollments_count,
+	du.registration_date
+from core.dim_user du
+left join core.enrollments e
+	on du.user_id = e.user_id
+left join core.fact_lesson_views flv
+	on du.user_id = flv.user_id
+where flv.user_id is NULL
+group by
+	du.user_id,
+	du.name,
+	du.email,
+	du.age,
+	du.registration_date
+order by du.user_id;
+
+select * from dm.inactive_users_summary;
+
+--Витрина dm.course_completion_rate
+CREATE MATERIALIZED VIEW dm.course_completion_rate as
+select
+	du.user_id,
+	du.name as user_name,
+	dc.course_id,
+	dc.title as course_title,
+	COUNT(DISTINCT dl.lesson_id) AS lessons_in_course,
+	COUNT(DISTINCT flv.lesson_id) AS lessons_viewed,
+	ROUND(COUNT(DISTINCT flv.lesson_id)::numeric / NULLIF(COUNT(DISTINCT dl.lesson_id), 0), 2) AS completion_rate
+from core.enrollments e
+left join core.dim_user du
+    on du.user_id = e.user_id
+left join core.dim_course dc
+    on dc.course_id = e.course_id
+left join core.dim_lesson dl
+    on dl.course_id = e.course_id
+left join core.fact_lesson_views flv
+    on flv.user_id = e.user_id
+   and flv.lesson_id = dl.lesson_id
+group by
+    du.user_id,
+	du.name,
+	dc.course_id,
+	dc.title
+order by du.user_id;
+
+select * from dm.course_completion_rate order by user_id;
+
+--Этап 5. Проверка 
+SELECT * FROM dm.lesson_popularity_summary LIMIT 10;
+SELECT * FROM dm.inactive_users_summary LIMIT 10;
+SELECT * FROM dm.course_completion_rate LIMIT 10;
+--Все витрины отображаются корректно. Скрины: "название витрины".png