Azamat
16 lines
596 B
SQL
16 lines
596 B
SQL
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) AS last_viewed,
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MIN(lv.viewed_at) AS first_viewed,
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ROUND (COUNT(DISTINCT lv.lesson_id) * 1.0 / NULLIF(COUNT(DISTINCT l.id), 0) * 100, 2) AS "engagement_rate(%)"
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FROM amaksatov.users u
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LEFT JOIN enrollments e ON e.user_id = u.id
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LEFT JOIN lessons l ON l.course_id = e.course_id
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LEFT JOIN lesson_views lv ON lv.lesson_id = l.id AND u.id = lv.user_id
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GROUP BY u.id;
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