Azamat
19 lines
711 B
SQL
19 lines
711 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 (
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CASE
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WHEN COUNT(DISTINCT l.id) = 0 THEN NULL
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ELSE COUNT(DISTINCT lv.lesson_id) * 1.0 / COUNT(DISTINCT l.id) * 100
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END, 2)::TEXT || '%' 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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HAVING COUNT(e.id) > 0; |