题解 | 商品id数据清洗统计
商品id数据清洗统计
https://www.nowcoder.com/practice/c985ecbd820b46e6bafa858f6600126d
SELECT
SUBSTRING_INDEX(order_id,'_',-1) product_id,
COUNT(DISTINCT SUBSTRING_INDEX(order_id,'_',1)) cnt
FROM order_log
GROUP BY SUBSTRING_INDEX(order_id,'_',-1)
