henu2024

分类

题解(1)

/ 注册

全部文章（共1篇）

题解 | #21年8月份练题总数#

select count(distinct(device_id)) as did_cnt, count(question_id) as question_cnt from question_practice_detail where year(date) = 2021 and month(date)...

Mysql

2022-04-03

6 381