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 a.gender,count(a.gender) as number
from(select device_id,
case when substring_index(profile,',',-1)='male' then 'male'
when substring_index(profile,',',-1)='female' then 'female'
end as gender
from user_submit) a
group by gender
