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 t1.device_id) AS did_cnt,
count(*) AS question_cnt
FROM
question_practice_detail t1
where date_format(t1.date, '%Y-%m') = '2021-08'
count(distinct t1.device_id) AS did_cnt,
count(*) AS question_cnt
FROM
question_practice_detail t1
where date_format(t1.date, '%Y-%m') = '2021-08'
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