题解 | #牛客的课程订单分析(四)#
牛客的课程订单分析(四)
https://www.nowcoder.com/practice/c93d2079282f4943a3771ca6fd081c23
SELECT
user_id,
min(date) first_buy_date,
count(product_name) cnt
FROM
order_info
WHERE date>"2025-10-15"
AND product_name IN ("C++","Java","Python")
AND status="completed"
GROUP BY user_id
HAVING count(product_name)>1
ORDER BY user_id
首先处理原始表，筛选出需要的数据，再进行计算即可
一次分组就能实现所有计算，所以并不复杂
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