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 gender,count(device_id) as number
from (
select (if (substring(gen1,-4)='male','male','female') )as gender
,device_id
from(
select device_id,replace(profile,'female','wman') as gen1
from user_submit
) as new1
) as new2
group by gender
好消息：运行成功；坏消息：嵌套了两层
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