题解 | #统计每种性别的人数#
统计每种性别的人数
http://www.nowcoder.com/practice/f04189f92f8d4f6fa0f383d413af7cb8
select
case
when profile like '%,male' then 'male'
when profile like '%,female' then 'female'
end gender ,count(device_id) from user_submit
case
when profile like '%,male' then 'male'
when profile like '%,female' then 'female'
end gender ,count(device_id) from user_submit
group by gender;
//case when 语句，每个when语句中间不用加，
