убрал : из папок
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mnoskov
+40
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CREATE MATERIALIZED VIEW user_cohort_analysis AS
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WITH users_and_enrollments_results AS (
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SELECT
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date_trunc('month', u.registration_date)::date AS cohort_month,
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count(DISTINCT u.id) AS users_in_cohort,
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count(DISTINCT e.user_id) AS enrolled_users,
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count(DISTINCT e.course_id) courses_in_cohort
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FROM
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users u
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JOIN
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enrollments e ON u.id = e.user_id
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GROUP BY
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cohort_month
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),
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lesson_views_results AS (
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SELECT
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date_trunc('month', u.registration_date)::date AS cohort_month,
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count(DISTINCT lv.user_id) AS active_users,
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round(avg(lv.viewed_at::date - u.registration_date::date), 0) AS avg_time_to_first_view
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FROM
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users u
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LEFT JOIN
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lesson_views lv ON u.id = lv.user_id
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GROUP BY
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cohort_month
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)
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SELECT
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uer.cohort_month,
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uer.users_in_cohort,
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uer.enrolled_users,
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lvr.active_users,
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round((lvr.active_users / uer.users_in_cohort::numeric) * 100, 2) || '%' AS retention_rate,
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round(uer.courses_in_cohort / uer.users_in_cohort::numeric, 2) AS avg_courses_per_user,
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lvr.avg_time_to_first_view
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FROM
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users_and_enrollments_results uer
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JOIN
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lesson_views_results lvr ON uer.cohort_month = lvr.cohort_month
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ORDER BY
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uer.cohort_month;
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+114
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CREATE MATERIALIZED VIEW conversion_funnel AS
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WITH stage_courses AS (
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-- registered
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(SELECT
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0 AS course_id,
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1 AS stage_id,
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'registered' AS stage_name,
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count(DISTINCT u.id) AS users_count
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FROM
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users u)
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UNION ALL
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-- enrolled
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(SELECT
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e.course_id,
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2 AS stage_id,
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'enrolled' AS stage_name,
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count(DISTINCT e.user_id) AS users_count
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FROM
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enrollments e
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GROUP BY
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e.course_id
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ORDER BY
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e.course_id)
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UNION ALL
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-- started
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(SELECT
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l.course_id,
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3 AS stage_id,
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'started' AS stage_name,
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count(DISTINCT lv.user_id) AS users_count
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FROM
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lessons l
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JOIN
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lesson_views lv ON l.id = lv.lesson_id
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GROUP BY
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l.course_id
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ORDER BY
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l.course_id)
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UNION ALL
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-- mid_progress
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(WITH lessons_mid AS (
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SELECT
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l.course_id,
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ceil(percentile_cont(0.5) WITHIN GROUP (ORDER BY l.id)) AS mid_in_lesson_id
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FROM
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lessons l
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GROUP BY
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l.course_id
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)
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SELECT
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lm.course_id,
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4 AS stage_id,
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'mid_progress' AS stage_name,
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count(lv.user_id) AS users_count
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FROM
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lessons_mid lm
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LEFT JOIN
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lesson_views lv ON lm.mid_in_lesson_id = lv.lesson_id
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GROUP BY
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lm.course_id, lm.mid_in_lesson_id
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ORDER BY
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lm.course_id)
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UNION ALL
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-- completed
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(WITH courses_lessons_id AS (
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SELECT
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l.course_id,
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l.id AS lesson_id
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FROM
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lessons l
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GROUP BY
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l.course_id, l.id
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),
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lessons_numbers AS (
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SELECT
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cli.course_id,
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cli.lesson_id,
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ROW_NUMBER() OVER(PARTITION BY cli.course_id ORDER BY cli.lesson_id DESC) AS lesson_number
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FROM
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courses_lessons_id cli
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)
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SELECT
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ln.course_id,
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5 AS stage_id,
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'completed' AS stage_name,
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count(lv.user_id) AS users_count
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FROM
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lessons_numbers ln
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LEFT JOIN
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lesson_views lv ON ln.lesson_id = lv.lesson_id
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WHERE
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ln.lesson_number = 1
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GROUP BY
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ln.course_id, ln.lesson_id
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ORDER BY
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ln.course_id)
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)
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SELECT
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sc.course_id,
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c.title AS course_title,
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sc.stage_name,
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sc.users_count,
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CASE
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WHEN lag(sc.users_count) OVER (PARTITION BY sc.course_id ORDER BY sc.stage_id) IS NULL THEN 'first stage'
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WHEN lag(sc.users_count) OVER (PARTITION BY sc.course_id ORDER BY sc.stage_id) = 0 THEN 0::text || '%'
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WHEN lag(sc.users_count) OVER (PARTITION BY sc.course_id ORDER BY sc.stage_id) IS NOT NULL THEN round((sc.users_count / lag(sc.users_count) OVER (PARTITION BY sc.course_id ORDER BY sc.stage_id)::NUMERIC) * 100, 0)::text || '%'
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END AS conversion_from_previous,
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round((sc.users_count / FIRST_VALUE(sc.users_count) OVER (ORDER BY sc.stage_id)::NUMERIC) * 100, 0)::text || '%' AS conversion_from_start
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FROM
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courses c
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RIGHT JOIN
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stage_courses sc ON c.id = sc.course_id
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ORDER BY
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sc.course_id;
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+41
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CREATE MATERIALIZED VIEW course_summary AS
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WITH courses_unique_users AS (
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SELECT
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e.course_id,
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count(e.user_id) AS unique_users
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FROM
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enrollments e
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GROUP BY
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e.course_id
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),
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lessons_results AS (
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SELECT
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l.course_id,
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count(distinct l.id) AS lessons_count,
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count(lv.lesson_id) AS total_views,
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min(lv.viewed_at)::date AS first_viewed_at,
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max(lv.viewed_at)::date AS last_viewed_at
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FROM
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lessons l
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LEFT JOIN
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lesson_views lv ON l.id = lv.lesson_id
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GROUP BY
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l.course_id
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)
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SELECT
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c.id AS course_id,
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c.title AS course_title,
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cuu.unique_users,
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lr.lessons_count,
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lr.total_views,
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round(lr.total_views / cuu.unique_users::numeric, 2) AS avg_views_per_user,
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lr.first_viewed_at,
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lr.last_viewed_at
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FROM
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courses c
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JOIN
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courses_unique_users cuu ON c.id = cuu.course_id
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JOIN
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lessons_results lr ON c.id = lr.course_id
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ORDER BY
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c.id;
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+39
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CREATE MATERIALIZED VIEW lesson_popularity_ranking as
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WITH lesson_views_results AS (
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SELECT
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lv.lesson_id,
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count(lv.user_id) AS total_views,
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count(DISTINCT lv.user_id) AS unique_viewers
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FROM
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lesson_views lv
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GROUP BY
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lv.lesson_id
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),
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enrollments_results AS (
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SELECT
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e.course_id,
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count(e.user_id) AS enrolled_to_course
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FROM
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enrollments e
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GROUP BY
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e.course_id
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)
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SELECT
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l.id AS lesson_id,
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l.title AS lesson_title,
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c.title AS course_title,
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lvr.total_views,
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lvr.unique_viewers,
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round(lvr.total_views / lvr.unique_viewers::numeric, 2) AS avg_views_per_viewer,
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dense_rank() OVER (ORDER BY lvr.total_views desc) AS popularity_rank,
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round((lvr.unique_viewers / er.enrolled_to_course::numeric) * 100, 0) || '%' AS completion_rate
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FROM
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lessons l
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JOIN
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courses c ON l.course_id = c.id
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JOIN
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lesson_views_results lvr ON l.id = lvr.lesson_id
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JOIN
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enrollments_results er ON c.id = er.course_id
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ORDER BY
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popularity_rank;
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+48
@@ -0,0 +1,48 @@
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CREATE MATERIALIZED VIEW platform_summary as
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WITH users_count AS (
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SELECT
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count(*) AS total_users
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FROM
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users
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),
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courses_count AS (
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SELECT
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count(*) AS total_courses
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FROM
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courses
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),
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lessons_count AS (
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SELECT
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count(*) AS total_lessons
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FROM
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lessons
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),
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users_with_views AS (
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SELECT
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count(distinct user_id) AS users_with_views
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FROM
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lesson_views
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),
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views_count AS (
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SELECT
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count(*) AS total_views
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FROM
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lesson_views lv
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)
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SELECT
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uc.total_users,
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cc.total_courses,
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lc.total_lessons,
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uwv.users_with_views,
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round(lc.total_lessons / cc.total_courses::NUMERIC, 2) AS avg_lessons_per_course,
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round(vc.total_views / lc.total_lessons::NUMERIC, 2) AS avg_views_per_lesson
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FROM
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users_count uc
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CROSS JOIN
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courses_count cc
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CROSS JOIN
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lessons_count lc
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CROSS JOIN
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users_with_views uwv
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CROSS JOIN
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views_count AS vc;
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+24
@@ -0,0 +1,24 @@
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CREATE MATERIALIZED VIEW user_activity_summary AS
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SELECT
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u.id AS user_id,
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u.name,
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count(DISTINCT e.course_id) AS enrollment_count,
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count(DISTINCT lv.lesson_id) AS viewed_lessons_count,
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max(lv.viewed_at)::date AS last_view,
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min(lv.viewed_at)::date AS first_view,
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((count(DISTINCT lv.lesson_id)::numeric(5,2) / count(DISTINCT l.id)) * 100)::numeric(5, 2) AS engagement_rate
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FROM
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users u
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JOIN
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enrollments e ON u.id = e.user_id
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JOIN
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courses c ON e.course_id = c.id
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JOIN
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lessons l ON c.id = l.course_id
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LEFT JOIN
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lesson_views lv ON u.id = lv.user_id -- сюда - 'AND l.id = lv.lesson_id'
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GROUP BY
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u.id, u.name
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ORDER BY
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u.id;
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-- Кинул его в нейронку на проверку, она сказала что надо добавить 'AND l.id = lv.lesson_id' при присоединении таблицы lesson_views(сделал пометку в коде), это нужно чтобы точно проверить, что урок который посмотрел пользователь точно принадлежит его курсу, чтобы избежать ошибок из-за некорректных данные если такие появятся в результате какого либо сбоя или ошибки.
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