dr0zd
17 lines
552 B
SQL
17 lines
552 B
SQL
create materialized view dm_course_summary as
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select
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e.course_id,
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c.title,
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count(distinct e.user_id) as unique_users,
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count(distinct l.id) as lessons_count,
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count(distinct lv.id) as total_views,
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round(count(distinct lv.id)*1.0/count(distinct e.user_id), 2) as avg_views_per_user,
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min(lv.viewed_at) as first_viewed_at,
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max(lv.viewed_at) as last_viewed_at
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from enrollments e
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join courses c on e.course_id = c.id
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join lessons l on c.id = l.course_id
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join lessons_views lv on lv.lesson_id = l.id
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group by e.course_id, c.title
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order by e.course_id
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