题解 | #21年8月份练题总数#

难道最严谨的不是这个写法吗

select count(distinct device_id) as did_cnt,

       count(distinct question_id) as question_cnt

from question_practice_detail

where `date` between '2021-08-01' and '2021-08-31'

select count(distinct device_id) as did_cnt,
       count(*) as question_cnt
from question_practice_detail
where `date` between '2021-08-01' and '2021-08-31'