單位經濟學

使用 SQL 分析商業資料

Michel Semaan

Data Scientist

單位經濟學

單位經濟學：以單一單位衡量表現，而非整體表現
例：每位使用者平均營收（ARPU）
- 公式：$\frac{Revenue}{Count\:of\:users}$
- 用途：衡量公司擴大商業模式的成功度

ARPU－查詢（I）

WITH kpis AS (
  SELECT
    SUM(meal_price * order_quantity) AS revenue,
    COUNT(DISTINCT user_id) AS users
  FROM meals
  JOIN orders ON meals.meal_id = orders.meal_id)

SELECT
  ROUND(
    revenue :: NUMERIC / GREATEST(users, 1),
  2) AS arpu
FROM kpis;

ARPU－按月查詢（I）

WITH kpis AS (
  SELECT
    DATE_TRUNC('month', order_date) AS delivr_month,
    SUM(meal_price * order_quantity) AS revenue,
    COUNT(DISTINCT user_id) AS users
  FROM meals
  JOIN orders ON m.meal_id = o.meal_id
  GROUP BY delivr_month)


SELECT
  delivr_month,
  ROUND(
    revenue :: NUMERIC / GREATEST(users, 1),
  2) AS arpu
FROM kpis
ORDER BY delivr_month ASC;

ARPU－查詢（II）

WITH user_revenues AS (
  SELECT
    user_id,
    SUM(meal_price * order_quantity) AS revenue
  FROM meals
  JOIN orders ON meals.meal_id = orders.meal_id
  GROUP BY user_id)

SELECT
  ROUND(AVG(revenue) :: NUMERIC, 2) AS arpu
FROM user_revenues;

兩種作法比較

方法一

revenue    users
---------  -----
260226.75  1304

方法二

user_id  revenue
-------  -------
0        262.75
1        160.5
2        255.25

ARPU－結果

arpu
------
199.56

單位經濟學

使用 SQL 分析商業資料