Drill 1: Make it smaller — Window functions
Write a smaller version of the example that keeps the core idea.
What you will be able to do
- Write a smaller version of the example that keeps the core idea.
Practice task
Write a smaller version of the example that keeps the core idea.
SELECT course_slug, title, minutes,
ROW_NUMBER() OVER (
PARTITION BY course_slug ORDER BY minutes DESC
) AS rank_in_course,
SUM(minutes) OVER (PARTITION BY course_slug) AS course_minutes,
ROUND(AVG(minutes) OVER (PARTITION BY course_slug), 1) AS course_avg
FROM lessons
ORDER BY course_slug, rank_in_course;Your turn
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Write a smaller version of the example that keeps the core idea.
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