题解 | #21年8月份练题总数#
21年8月份练题总数
http://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
SELECT
count( DISTINCT ( device_id ) ) AS did_cnt,
count( * ) AS question_cnt
FROM
question_practice_detail
WHERE
date LIKE '2021-08%';
So Easy.