题解 | #SQL39
21年8月份练题总数
http://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
select count(distinct(device_id)) as did_cnt,count(question_id) as question_cnt from question_practice_detail where month(date) = 8
21年8月份练题总数
http://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
select count(distinct(device_id)) as did_cnt,count(question_id) as question_cnt from question_practice_detail where month(date) = 8
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