题解 | 统计每种性别的人数
统计每种性别的人数
https://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
select
gender
,count(*) number
from
(select
device_id
,case
when INSTR(profile, 'female') then 'female'
else 'male' end as gender
from
user_submit) gender_info
group by gender