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