题解 | #统计每种性别的人数#

CASE-WHEN解法：

需要注意！！！如果直接用profile like "%male"语句进行条件筛查会出问题！因为female中也含有male,会导致判断错误

select 
case
    when profile like "%,male" then 'male'
    when profile like "%,female" then 'female'
end as gender,count(*) as number
from user_submit
group by gender