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(*) as number
from
(select device_id,
case
when profile like "%,male%" then 'male'
when profile like "%,female%" then 'female'
end as gender
from user_submit) as a
group by gender;
使用case when与字符串匹配like实现。
