dr0zd
71 lines
2.0 KiB
SQL
71 lines
2.0 KiB
SQL
--lesson_popularity_summary data mart
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create materialized view dm.lesson_popularity_summary as
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select
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dl.lesson_id,
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dl.title as lesson_title,
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dl.course_id,
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dc.title as course_title,
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count(flv.lesson_id) as total_views,
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count(distinct flv.user_id) as unique_users,
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min(flv.viewed_at) as first_view,
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max(flv.viewed_at) as last_view
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from core.dim_lesson dl
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left join core.dim_course dc
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on dl.course_id = dc.course_id
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left join core.fact_lesson_views flv
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on dl.lesson_id = flv.lesson_id
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group by dl.lesson_id, dl.title, dl.course_id, dc.title
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-- inactive_users_summary data mart
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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 du.user_id, du.name, du.email, du.age, du.registration_date
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-- course_completion_rate data mart
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create materialized view dm.course_completion_rate as
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with total_lessons_per_course as(
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select
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course_id,
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count(*) as lessons_in_course
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from core.dim_lesson
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group by course_id
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), lessons_viewed as (
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select
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user_id,
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course_id,
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count(*) as lessons_viewed
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from fact_lesson_views flv
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group by user_id, course_id
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)
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select
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du.user_id as user_id,
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du.name as user_name,
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dc.course_id as course_id,
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dc.title as course_title,
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tlpc.lessons_in_course,
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coalesce(lv.lessons_viewed, 0) as lessons_viewed,
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round(
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coalesce(
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coalesce(lv.lessons_viewed, 0)*1.0/nullif(tlpc.lessons_in_course, 0), 0
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), 2) as completion_rate
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from core.enrollments e
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join core.dim_user du
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on e.user_id = du.user_id
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join total_lessons_per_course tlpc
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on tlpc.course_id = e.course_id
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join core.dim_course dc
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on e.course_id = dc.course_id
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left join lessons_viewed lv
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on du.user_id = lv.user_id and dc.course_id = lv.course_id |