题解 | #牛客的课程订单分析(四)#
牛客的课程订单分析(四)
http://www.nowcoder.com/practice/c93d2079282f4943a3771ca6fd081c23
SELECT * FROM order_info;
SELECT user_id,MIN(DATE),cnt FROM
(SELECT ,COUNT() OVER (PARTITION BY user_id) cnt
FROM order_info WHERE status='completed'
AND product_name IN ('c++','python','java')
AND DATE >'2025-10-15')a
WHERE cnt>=2
GROUP BY user_id
ORDER BY user_id ASC
；
SELECT user_id, MIN(DATE) first_buy_date, COUNT(*) cnt
FROM order_info
WHERE status='completed'
AND product_name IN ('c++','python','java')
AND DATE >'2025-10-15'
GROUP BY user_id
HAVING cnt>1
ORDER BY user_id ASC
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