题解 | #计算用户8月每天的练题数量#
计算用户8月每天的练题数量
https://www.nowcoder.com/practice/847373e2fe8d47b4a2c294bdb5bda8b6
SELECT if(SUBSTRING(date,9,1) = "0",SUBSTRING(date,10,1),SUBSTRING(date,9,2) ) as day , count(question_id) from question_practice_detail group by day