题解 | #统计每种性别的人数#

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