SERGEY_KONEV
40 lines
1.1 KiB
SQL
40 lines
1.1 KiB
SQL
/*
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- ВИТРИНА ДЛЯ АНАЛИЗА КОНВЕРСИИ ПРОХОЖДЕНИЯ КУРСА ПОЛЬЗОВАТЕЛЯМИ
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- CORE.DIM_USER И CORE.FACT_LESSON_VIEWS DISTRIBUTED BY (user_id)
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- ИТОГОВОЕ РАСПРЕДЕЛЕНИЕ ПО (user_id, course_id)
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*/
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CREATE MATERIALIZED VIEW IF NOT EXISTS dm.course_completion_rate AS
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WITH t1 AS (
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SELECT
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e.user_id,
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du.name AS user_name,
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e.course_id,
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dc.title AS course_title,
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COUNT(DISTINCT dl.lesson_id) AS lessons_in_course
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FROM core.enrollments e
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JOIN core.dim_user du USING (user_id)
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JOIN core.dim_course dc USING (course_id)
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LEFT JOIN core.dim_lesson dl USING (course_id)
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GROUP BY user_id, du.name, course_id, dc.title
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),
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t2 AS (
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SELECT
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user_id,
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course_id,
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COUNT(DISTINCT lesson_id) AS lessons_viewed
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FROM core.fact_lesson_views
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GROUP BY user_id, course_id
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)
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SELECT
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t1.user_id,
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t1.user_name,
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t1.course_id,
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t1.course_title,
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t1.lessons_in_course,
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COALESCE(t2.lessons_viewed, 0) AS lessons_viewed,
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COALESCE(ROUND(lessons_viewed::DECIMAL / NULLIF(lessons_in_course, 0), 2), 0) AS completion_rate
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FROM t1
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LEFT JOIN t2 USING (user_id, course_id)
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DISTRIBUTED BY (user_id, course_id); |