题解 | 淘宝店铺的实际销售额与客单价

WITH t1 AS (
    SELECT
    s.goods_id,
    sum(sales_num) * max(goods_price) sales
    FROM sales_tb s JOIN goods_tb g USING(goods_id)
    GROUP BY s.goods_id
)
SELECT
round(sum(t1.sales),3) sales_total,
round(sum(t1.sales)/(SELECT count(DISTINCT user_id) FROM sales_tb),3) 
FROM t1