LeetCode（数据库）- 即时食物配送 II

Posted 2021-09-09 程序员牧码

题目链接：点击打开链接

题目大意：略。

解题思路：略。

AC 代码

-- 解决方案(1)
SELECT ROUND(COUNT(1) / (SELECT COUNT(DISTINCT customer_id) FROM Delivery) * 100, 2) immediate_percentage
FROM Delivery
WHERE order_date = customer_pref_delivery_date AND (customer_id, order_date) IN (SELECT customer_id, MIN(order_date) order_date FROM Delivery GROUP BY customer_id)

-- 解决方案(2)
select round (
    sum(order_date = customer_pref_delivery_date) * 100 /
    count(*),
    2
) as immediate_percentage
from Delivery
where (customer_id, order_date) in (
    select customer_id, min(order_date)
    from delivery
    group by customer_id
)