SERGEY_KONEV
38 lines
841 B
PL/PgSQL
38 lines
841 B
PL/PgSQL
BEGIN;
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CREATE MATERIALIZED VIEW user_activity_summary AS
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WITH users_views 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 lv.lesson_id) AS viewed_lessons_count,
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MAX(lv.viewed_at) AS last_view,
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MIN(lv.viewed_at) AS first_view
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FROM users AS u
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JOIN lesson_views AS lv on u.id = lv.user_id
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GROUP BY u.id
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),
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users_engagement AS (
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SELECT
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e.user_id AS user_id,
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COUNT(DISTINCT l.id) AS lessons_cnt,
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COUNT(DISTINCT course_id) AS enrollment_count
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FROM enrollments AS e
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JOIN lessons AS l using(course_id)
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GROUP BY e.user_id
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)
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SELECT
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uv.user_id,
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uv.name,
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ue.enrollment_count,
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uv.viewed_lessons_count,
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uv.last_view,
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uv.first_view,
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ROUND(uv.viewed_lessons_count::DECIMAL / NULLIF(ue.lessons_cnt, 0) * 100, 2) AS engagement_rate
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FROM users_views AS uv
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LEFT JOIN users_engagement AS ue using (user_id)
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ORDER BY uv.user_id
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COMMIT; |