Drill 27: Predict the output — Window functions

Describe the output you expect and how you would check it.

Beginner 5 min read Lesson 444 of 480 Challenge included

What you will be able to do

Describe the output you expect and how you would check it.

Practice task

Describe the output you expect and how you would check it.

windows.sqlSQL

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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Easy

Describe the output you expect and how you would check it.

TEXT · starter

Your answer…

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Next: Drill 27: Beginner mistake — Text and dates

Lesson 444 of 480 · 0% of course