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) = '08'
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) = '08'
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