dr0zd
17 lines
563 B
SQL
17 lines
563 B
SQL
create materialized view dm_course_summary as
|
|
select
|
|
e.course_id,
|
|
c.title,
|
|
count(distinct e.user_id) as unique_users,
|
|
count(distinct l.id) as lessons_count,
|
|
count(distinct lv.id) as total_views,
|
|
round(count(distinct lv.id)*1.0/nullif(count(distinct e.user_id), 0), 2) as avg_views_per_user,
|
|
min(lv.viewed_at) as first_viewed_at,
|
|
max(lv.viewed_at) as last_viewed_at
|
|
from enrollments e
|
|
join courses c on e.course_id = c.id
|
|
join lessons l on c.id = l.course_id
|
|
join lessons_views lv on lv.lesson_id = l.id
|
|
group by e.course_id, c.title
|
|
order by e.course_id
|