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题解 | #浙江大学用户题目回答情况#

select substr(date, 9, 2) as day, count(*) as question_cnt from question_practice_detail where date like '2021-08-%' group by date -- substr('strin...

Mysql

2022-01-15

2 201

题解 | #分组计算练习题#

select gender, university, count(*) as user_num, avg(active_days_within_30) as avg_active_day, avg(question_cnt) as avg_question_cnt from user_pro...

Mysql

2022-01-10

0 223