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
device_id去重,模糊匹配日期,2个字段聚合count
select count(distinct device_id去重,模糊匹配日期,2个字段聚合count) as did_cnt,count(question_id) as question_cnt
from question_practice_detail
where date like '2021-08-%';