Dmitry Medvedev
63 lines
1.7 KiB
SQL
63 lines
1.7 KiB
SQL
--Активность пользователей
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CREATE MATERIALIZED VIEW user_activity_summary AS
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--CTE кол-во курсов на которые записан пользователь
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WITH enrollment_count AS (
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SELECT
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pe.user_id,
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COUNT(*) AS enrollment_count
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FROM pet_enrollments pe
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GROUP BY pe.user_id
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),
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--CTE просмотренные уникальные уроки пользователем (кол-во)
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viewed_lessons_count AS (
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SELECT
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plv.user_id,
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DENSE_RANK() OVER(
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PARTITION BY plv.user_id
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ORDER BY plv.lesson_id
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) AS viewed_lessons_count
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FROM pet_lesson_views plv
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),
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--CTE дата и время последнего просмотра урока
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last_view AS (
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SELECT
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plv.user_id,
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LAST_VALUE(plv.viewed_at) OVER (
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PARTITION BY plv.user_id
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ORDER BY plv.viewed_at
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ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
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) AS last_view
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FROM pet_lesson_views plv
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),
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--CTE дата и время первого просмотра урока
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first_view AS (
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SELECT
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plv.user_id,
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FIRST_VALUE(plv.viewed_at) OVER (
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PARTITION BY plv.user_id
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ORDER BY plv.viewed_at
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) AS first_view
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FROM pet_lesson_views plv
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)
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SELECT
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pu.id AS user_id,
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pu.name AS name,
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ec.enrollment_count AS enrollment_count,
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MAX(vlc.viewed_lessons_count) AS viewed_lessons_count,
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last_view,
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first_view,
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ROUND(MAX(vlc.viewed_lessons_count * 100.0 / (SELECT COUNT(*) FROM pet_lessons pl)), 2) || '%' AS engagement_rate
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FROM pet_users pu
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LEFT JOIN enrollment_count ec ON pu.id = ec.user_id
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LEFT JOIN viewed_lessons_count vlc ON pu.id = vlc.user_id
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LEFT JOIN last_view lv ON pu.id = lv.user_id
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LEFT JOIN first_view fv ON pu.id = fv.user_id
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GROUP BY pu.id, ec.enrollment_count, last_view, first_view
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ORDER BY pu.id; |