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 device_id, substring_index(profile, ',', -1) as gender
from user_submit
) as b
group by gender;
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