题解 | #21年8月份练题总数#
21年8月份练题总数
https://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
#1.2021年8月份 year(date)='2021' and month(date)='8'
#2.总用户数 count(dinstic device_id)
#3.总练习次数 count(question_id)
select
count(distinct device_id) as did_cnt,
count(question_id) as question_cnt
from question_practice_detail as qpd
where year(qpd.date)='2021' and month(qpd.date)='8'
#1.2021年8月份 year(date)='2021' and month(date)='8'
#2.总用户数 count(dinstic device_id)
#3.总练习次数 count(question_id)
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