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
case
when profile like '%,male' then 'male'
when profile like '%,female' then 'female'
else 'null gender'
end as gender,
count(1)
from user_submit
group by gender
case第一次写，注意 when X like A then 自己定义A
else ' B '
count(1)是对第一列的计数
