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Revenue quartiles

Dave is wrapping up his study, and wants to calculate a few more figures. He wants to find out the first, second, and third revenue quartiles. He also wants to find the average to see in which direction the data is skewed.

Calculate the first, second, and third revenue quartiles, as well as the average.

Note: You can calculate the 30th percentile for a column named column_a by using PERCENTILE_CONT(0.30) WITHIN GROUP (ORDER BY column_a ASC).

Este exercício faz parte do curso

Analyzing Business Data in SQL

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Instruções do exercício

  • Store each user ID and the revenue Delivr generates from it in the user_revenues CTE.
  • Calculate the first, second, and third revenue quartile.
  • Calculate the average revenue.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

WITH user_revenues AS (
  -- Select the user IDs and their revenues
  SELECT
    ___,
    ___ AS revenue
  FROM meals AS m
  JOIN orders AS o ON m.meal_id = o.meal_id
  GROUP BY user_id)

SELECT
  -- Calculate the first, second, and third quartile
  ROUND(
    ___ :: ___,
  2) AS revenue_p25,
  ROUND(
    ___ :: ___,
  2) AS revenue_p50,
  ROUND(
    ___ :: ___,
  2) AS revenue_p75,
  -- Calculate the average
  ROUND(___ :: ___, 2) AS avg_revenue
FROM user_revenues;
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